diff --git a/documents/Specification/MaterialX.Proposals.md b/documents/Specification/MaterialX.Proposals.md
index d387d28718..1aaa930923 100644
--- a/documents/Specification/MaterialX.Proposals.md
+++ b/documents/Specification/MaterialX.Proposals.md
@@ -219,12 +219,6 @@ In #1201 it was decided that separate periodic versions of all of the noises is
 
 * **`bump`**: Existing node, proposal to add a vector3 `bitangent` input
 
-<a id="node-geompropvalueuniform"> </a>
-
-* **`geompropvalueuniform`**: the value of the specified uniform geometric property (defined using &lt;geompropdef>) of the currently-bound geometry.  This node's type must match that of the referenced geomprop.
-    * `geomprop` (uniform string): the geometric property to be referenced.
-    * `default` (same type as the geomprop's value): a value to return if the specified `geomprop` is not defined on the current geometry.
-
 Note: when &lt;geompropvalueuniform> is added, the text in the first paragraph of the Specification about Node Inputs should be revised to include "&lt;geompropvalueuniform>" as an example of "or any other node whose output is explicitly declared to be uniform".
 
 
diff --git a/documents/Specification/MaterialX.Specification.md b/documents/Specification/MaterialX.Specification.md
index 65027694d8..4ad29dc963 100644
--- a/documents/Specification/MaterialX.Specification.md
+++ b/documents/Specification/MaterialX.Specification.md
@@ -1091,6 +1091,12 @@ Standard Geometric nodes:
     * `geomprop` (uniform string): the geometric property to be referenced.
     * `default` (same type as the geomprop's value): a value to return if the specified `geomprop` is not defined on the current geometry.
 
+<a id="node-geompropvalueuniform"> </a>
+
+* **`geompropvalueuniform`**: the value of the specified uniform geometric property (defined using &lt;geompropdef>) of the currently-bound geometry.  This node's type must match that of the referenced geomprop.
+    * `geomprop` (uniform string): the geometric property to be referenced.
+    * `default` (same type as the geomprop's value): a value to return if the specified `geomprop` is not defined on the current geometry.
+
 Additionally, the `geomcolor` and `geompropvalue` nodes for color3/color4-type properties can take a `colorspace` attribute to declare what colorspace the color property value is in; the default is "none" for no colorspace declaration (and hence no colorspace conversion).
 
 
diff --git a/libraries/bxdf/usd_preview_surface.mtlx b/libraries/bxdf/usd_preview_surface.mtlx
index 4abdb91d9f..afc6954af9 100644
--- a/libraries/bxdf/usd_preview_surface.mtlx
+++ b/libraries/bxdf/usd_preview_surface.mtlx
@@ -62,8 +62,13 @@
   </nodedef>
   <nodedef name="ND_UsdPrimvarReader_string" nodegroup="geometric" node="UsdPrimvarReader">
     <input name="varname" type="string" value="" uniform="true" />
-    <input name="fallback" type="string" value="" />
-    <output name="out" type="string" />
+    <input name="fallback" type="string" value="" uniform="true" />
+    <output name="out" type="string" uniform="true"/>
+  </nodedef>
+  <nodedef name="ND_UsdPrimvarReader_filename" nodegroup="geometric" node="UsdPrimvarReader">
+    <input name="varname" type="string" value="" uniform="true" />
+    <input name="fallback" type="filename" value="" uniform="true" />
+    <output name="out" type="filename" uniform="true"/>
   </nodedef>
   <nodedef name="ND_UsdPrimvarReader_float" nodegroup="geometric" node="UsdPrimvarReader">
     <input name="varname" type="string" value="" uniform="true" />
@@ -359,11 +364,18 @@
     <output name="out" type="boolean" nodename="primvar" />
   </nodegraph>
   <nodegraph name="IMP_UsdPrimvarReader_string" nodedef="ND_UsdPrimvarReader_string">
-    <geompropvalue name="primvar" type="string">
+    <geompropvalueuniform name="primvar" type="string">
       <input name="geomprop" type="string" interfacename="varname" />
       <input name="default" type="string" interfacename="fallback" />
-    </geompropvalue>
-    <output name="out" type="string" nodename="primvar" />
+    </geompropvalueuniform>
+    <output name="out" type="string" nodename="primvar" uniform="true" />
+  </nodegraph>
+  <nodegraph name="IMP_UsdPrimvarReader_filename" nodedef="ND_UsdPrimvarReader_filename">
+    <geompropvalueuniform name="primvar" type="filename">
+      <input name="geomprop" type="string" interfacename="varname" />
+      <input name="default" type="filename" interfacename="fallback" />
+    </geompropvalueuniform>
+    <output name="out" type="filename" nodename="primvar" uniform="true" />
   </nodegraph>
   <nodegraph name="IMP_UsdPrimvarReader_float" nodedef="ND_UsdPrimvarReader_float">
     <geompropvalue name="primvar" type="float">
diff --git a/libraries/stdlib/genglsl/stdlib_genglsl_impl.mtlx b/libraries/stdlib/genglsl/stdlib_genglsl_impl.mtlx
index ad3a21e9cf..0625d17a25 100644
--- a/libraries/stdlib/genglsl/stdlib_genglsl_impl.mtlx
+++ b/libraries/stdlib/genglsl/stdlib_genglsl_impl.mtlx
@@ -157,7 +157,6 @@
   <!-- <geompropvalue> -->
   <implementation name="IM_geompropvalue_integer_genglsl" nodedef="ND_geompropvalue_integer" function="mx_geompropvalue_int" target="genglsl" />
   <implementation name="IM_geompropvalue_boolean_genglsl" nodedef="ND_geompropvalue_boolean" function="mx_geompropvalue_bool" target="genglsl" />
-  <implementation name="IM_geompropvalue_string_genglsl" nodedef="ND_geompropvalue_string" function="mx_geompropvalue_string" target="genglsl" />
   <implementation name="IM_geompropvalue_float_genglsl" nodedef="ND_geompropvalue_float" function="mx_geompropvalue_float" target="genglsl" />
   <implementation name="IM_geompropvalue_color3_genglsl" nodedef="ND_geompropvalue_color3" function="mx_geompropvalue_color" target="genglsl" />
   <implementation name="IM_geompropvalue_color4_genglsl" nodedef="ND_geompropvalue_color4" function="mx_geompropvalue_color4" target="genglsl" />
@@ -165,6 +164,10 @@
   <implementation name="IM_geompropvalue_vector3_genglsl" nodedef="ND_geompropvalue_vector3" function="mx_geompropvalue_vector" target="genglsl" />
   <implementation name="IM_geompropvalue_vector4_genglsl" nodedef="ND_geompropvalue_vector4" function="mx_geompropvalue_vector4" target="genglsl" />
 
+  <!-- <geompropvalueuniform> -->
+  <implementation name="IM_geompropvalue_string_genglsl" nodedef="ND_geompropvalueuniform_string" function="mx_geompropvalue_string" target="genglsl" />
+  <implementation name="IM_geompropvalue_filename_genglsl" nodedef="ND_geompropvalueuniform_filename" function="mx_geompropvalue_string" target="genglsl" />
+
   <!-- ======================================================================== -->
   <!-- Application nodes                                                        -->
   <!-- ======================================================================== -->
diff --git a/libraries/stdlib/genmdl/stdlib_genmdl_impl.mtlx b/libraries/stdlib/genmdl/stdlib_genmdl_impl.mtlx
index 6ac2b862dd..05dbc995d6 100644
--- a/libraries/stdlib/genmdl/stdlib_genmdl_impl.mtlx
+++ b/libraries/stdlib/genmdl/stdlib_genmdl_impl.mtlx
@@ -159,7 +159,6 @@
   <!-- <geompropvalue> -->
   <implementation name="IM_geompropvalue_integer_genmdl" nodedef="ND_geompropvalue_integer" sourcecode="materialx::stdlib_{{MDL_VERSION_SUFFIX}}::mx_geompropvalue_integer(mxp_geomprop:{{geomprop}}, mxp_default:{{default}})" target="genmdl" />
   <implementation name="IM_geompropvalue_boolean_genmdl" nodedef="ND_geompropvalue_boolean" sourcecode="materialx::stdlib_{{MDL_VERSION_SUFFIX}}::mx_geompropvalue_boolean(mxp_geomprop:{{geomprop}}, mxp_default:{{default}})" target="genmdl" />
-  <implementation name="IM_geompropvalue_string_genmdl" nodedef="ND_geompropvalue_string" sourcecode="materialx::stdlib_{{MDL_VERSION_SUFFIX}}::mx_geompropvalue_string(mxp_geomprop:{{geomprop}}, mxp_default:{{default}})" target="genmdl" />
   <implementation name="IM_geompropvalue_float_genmdl" nodedef="ND_geompropvalue_float" sourcecode="materialx::stdlib_{{MDL_VERSION_SUFFIX}}::mx_geompropvalue_float(mxp_geomprop:{{geomprop}}, mxp_default:{{default}})" target="genmdl" />
   <implementation name="IM_geompropvalue_color3_genmdl" nodedef="ND_geompropvalue_color3" sourcecode="materialx::stdlib_{{MDL_VERSION_SUFFIX}}::mx_geompropvalue_color3(mxp_geomprop:{{geomprop}}, mxp_default:{{default}})" target="genmdl" />
   <implementation name="IM_geompropvalue_color4_genmdl" nodedef="ND_geompropvalue_color4" sourcecode="materialx::stdlib_{{MDL_VERSION_SUFFIX}}::mx_geompropvalue_color4(mxp_geomprop:{{geomprop}}, mxp_default:{{default}})" target="genmdl" />
@@ -167,6 +166,10 @@
   <implementation name="IM_geompropvalue_vector3_genmdl" nodedef="ND_geompropvalue_vector3" sourcecode="materialx::stdlib_{{MDL_VERSION_SUFFIX}}::mx_geompropvalue_vector3(mxp_geomprop:{{geomprop}}, mxp_default:{{default}})" target="genmdl" />
   <implementation name="IM_geompropvalue_vector4_genmdl" nodedef="ND_geompropvalue_vector4" sourcecode="materialx::stdlib_{{MDL_VERSION_SUFFIX}}::mx_geompropvalue_vector4(mxp_geomprop:{{geomprop}}, mxp_default:{{default}})" target="genmdl" />
 
+  <!-- <geompropvalueuniform> -->
+  <implementation name="IM_geompropvalue_string_genmdl" nodedef="ND_geompropvalueuniform_string" sourcecode="materialx::stdlib_{{MDL_VERSION_SUFFIX}}::mx_geompropvalue_string(mxp_geomprop:{{geomprop}}, mxp_default:{{default}})" target="genmdl" />
+  <implementation name="IM_geompropvalue_filename_genmdl" nodedef="ND_geompropvalueuniform_filename" sourcecode="materialx::stdlib_{{MDL_VERSION_SUFFIX}}::mx_geompropvalue_string(mxp_geomprop:{{geomprop}}, mxp_default:{{default}})" target="genmdl" />
+
   <!-- ======================================================================== -->
   <!-- Application nodes                                                        -->
   <!-- ======================================================================== -->
diff --git a/libraries/stdlib/genmsl/stdlib_genmsl_impl.mtlx b/libraries/stdlib/genmsl/stdlib_genmsl_impl.mtlx
index 3cb99052cf..ea09880543 100644
--- a/libraries/stdlib/genmsl/stdlib_genmsl_impl.mtlx
+++ b/libraries/stdlib/genmsl/stdlib_genmsl_impl.mtlx
@@ -73,7 +73,6 @@
   <!-- <geompropvalue> -->
   <implementation name="IM_geompropvalue_integer_genmsl" nodedef="ND_geompropvalue_integer" function="mx_geompropvalue_int" target="genmsl" />
   <implementation name="IM_geompropvalue_boolean_genmsl" nodedef="ND_geompropvalue_boolean" function="mx_geompropvalue_bool" target="genmsl" />
-  <implementation name="IM_geompropvalue_string_genmsl" nodedef="ND_geompropvalue_string" function="mx_geompropvalue_string" target="genmsl" />
   <implementation name="IM_geompropvalue_float_genmsl" nodedef="ND_geompropvalue_float" function="mx_geompropvalue_float" target="genmsl" />
   <implementation name="IM_geompropvalue_color3_genmsl" nodedef="ND_geompropvalue_color3" function="mx_geompropvalue_color" target="genmsl" />
   <implementation name="IM_geompropvalue_color4_genmsl" nodedef="ND_geompropvalue_color4" function="mx_geompropvalue_color4" target="genmsl" />
@@ -81,6 +80,10 @@
   <implementation name="IM_geompropvalue_vector3_genmsl" nodedef="ND_geompropvalue_vector3" function="mx_geompropvalue_vector" target="genmsl" />
   <implementation name="IM_geompropvalue_vector4_genmsl" nodedef="ND_geompropvalue_vector4" function="mx_geompropvalue_vector4" target="genmsl" />
 
+  <!-- <geompropvalueuniform> -->
+  <implementation name="IM_geompropvalue_string_genmsl" nodedef="ND_geompropvalueuniform_string" function="mx_geompropvalue_string" target="genmsl" />
+  <implementation name="IM_geompropvalue_filename_genmsl" nodedef="ND_geompropvalueuniform_filename" function="mx_geompropvalue_string" target="genmsl" />
+
   <!-- ======================================================================== -->
   <!-- Application nodes                                                        -->
   <!-- ======================================================================== -->
diff --git a/libraries/stdlib/genosl/stdlib_genosl_impl.mtlx b/libraries/stdlib/genosl/stdlib_genosl_impl.mtlx
index db318976c5..bd2e2540b5 100644
--- a/libraries/stdlib/genosl/stdlib_genosl_impl.mtlx
+++ b/libraries/stdlib/genosl/stdlib_genosl_impl.mtlx
@@ -159,7 +159,6 @@
   <!-- <geompropvalue> -->
   <implementation name="IM_geompropvalue_integer_genosl" nodedef="ND_geompropvalue_integer" file="mx_geompropvalue_integer.osl" function="mx_geompropvalue_integer" target="genosl" />
   <implementation name="IM_geompropvalue_boolean_genosl" nodedef="ND_geompropvalue_boolean" file="mx_geompropvalue_boolean.osl" function="mx_geompropvalue_boolean" target="genosl" />
-  <implementation name="IM_geompropvalue_string_genosl" nodedef="ND_geompropvalue_string" file="mx_geompropvalue_string.osl" function="mx_geompropvalue_string" target="genosl" />
   <implementation name="IM_geompropvalue_float_genosl" nodedef="ND_geompropvalue_float" file="mx_geompropvalue_float.osl" function="mx_geompropvalue_float" target="genosl" />
   <implementation name="IM_geompropvalue_color3_genosl" nodedef="ND_geompropvalue_color3" file="mx_geompropvalue_color3.osl" function="mx_geompropvalue_color" target="genosl" />
   <implementation name="IM_geompropvalue_color4_genosl" nodedef="ND_geompropvalue_color4" file="mx_geompropvalue_color4.osl" function="mx_geompropvalue_color4" target="genosl" />
@@ -167,6 +166,10 @@
   <implementation name="IM_geompropvalue_vector3_genosl" nodedef="ND_geompropvalue_vector3" file="mx_geompropvalue_vector3.osl" function="mx_geompropvalue_vector" target="genosl" />
   <implementation name="IM_geompropvalue_vector4_genosl" nodedef="ND_geompropvalue_vector4" file="mx_geompropvalue_vector4.osl" function="mx_geompropvalue_vector4" target="genosl" />
 
+  <!-- <geompropvalueuniform> -->
+  <implementation name="IM_geompropvalue_string_genosl" nodedef="ND_geompropvalueuniform_string" file="mx_geompropvalue_string.osl" function="mx_geompropvalue_string" target="genosl" />
+  <implementation name="IM_geompropvalue_filename_genosl" nodedef="ND_geompropvalueuniform_filename" file="mx_geompropvalue_string.osl" function="mx_geompropvalue_string" target="genosl" />
+
   <!-- ======================================================================== -->
   <!-- Application nodes                                                        -->
   <!-- ======================================================================== -->
diff --git a/libraries/stdlib/stdlib_defs.mtlx b/libraries/stdlib/stdlib_defs.mtlx
index 8f86a03b44..7e6be9b050 100644
--- a/libraries/stdlib/stdlib_defs.mtlx
+++ b/libraries/stdlib/stdlib_defs.mtlx
@@ -1355,11 +1355,6 @@
     <input name="default" type="boolean" value="false" />
     <output name="out" type="boolean" default="false" />
   </nodedef>
-  <nodedef name="ND_geompropvalue_string" node="geompropvalue" nodegroup="geometric">
-    <input name="geomprop" type="string" value="" uniform="true" />
-    <input name="default" type="string" value="" uniform="true" />
-    <output name="out" type="string" default="" />
-  </nodedef>
   <nodedef name="ND_geompropvalue_float" node="geompropvalue" nodegroup="geometric">
     <input name="geomprop" type="string" value="" uniform="true" />
     <input name="default" type="float" value="0.0" />
@@ -1391,6 +1386,22 @@
     <output name="out" type="vector4" default="0.0, 0.0, 0.0, 0.0" />
   </nodedef>
 
+  <!--
+    Node: <geompropvalueuniform>
+    The uniform, non-varying value of the specified geometric property for the current geometry.
+  -->
+  <nodedef name="ND_geompropvalueuniform_string" node="geompropvalueuniform" nodegroup="geometric">
+    <input name="geomprop" type="string" value="" uniform="true" />
+    <input name="default" type="string" value="" uniform="true" />
+    <output name="out" type="string" default="" uniform="true" />
+  </nodedef>
+  <nodedef name="ND_geompropvalueuniform_filename" node="geompropvalueuniform" nodegroup="geometric">
+    <input name="geomprop" type="string" value="" uniform="true" />
+    <input name="default" type="filename" value="" uniform="true" />
+    <output name="out" type="filename" default="" uniform="true" />
+  </nodedef>
+
+
   <!--
     Node: <bump>
     Offset the surface normal by a scalar value.
diff --git a/resources/Materials/TestSuite/stdlib/geometric/geompropvalue.mtlx b/resources/Materials/TestSuite/stdlib/geometric/geompropvalue.mtlx
index 82d3ad5bb0..109a5e0546 100644
--- a/resources/Materials/TestSuite/stdlib/geometric/geompropvalue.mtlx
+++ b/resources/Materials/TestSuite/stdlib/geometric/geompropvalue.mtlx
@@ -22,13 +22,13 @@
   <geompropvalue name="geompropvalue_boolean" type="boolean">
     <input name="geomprop" type="string" value="geompropvalue_bool" />
   </geompropvalue>
-  <output name="geompropvalue_string_out" type="color3" nodename="swizzle1" />
+  <output name="geompropvalueuniform_string_out" type="color3" nodename="swizzle1" />
   <constant name="swizzle1" type="color3">
     <input name="value" type="color3" value="0.5, 0.5, 0.5" />
   </constant>
-  <geompropvalue name="geompropvalue_string" type="string">
-    <input name="geomprop" type="string" value="geompropvalue_string" />
-  </geompropvalue>
+  <geompropvalueuniform name="geompropvalueuniform_string" type="string">
+    <input name="geomprop" type="string" value="geompropvalueuniform_string" />
+  </geompropvalueuniform>
   <output name="geompropvalue_float_out" type="float" nodename="geompropvalue_float" />
   <geompropvalue name="geompropvalue_float" type="float">
     <input name="geomprop" type="string" value="geompropvalue_float" />
diff --git a/source/MaterialXGenGlsl/GlslShaderGenerator.cpp b/source/MaterialXGenGlsl/GlslShaderGenerator.cpp
index c648441c7e..4566073779 100644
--- a/source/MaterialXGenGlsl/GlslShaderGenerator.cpp
+++ b/source/MaterialXGenGlsl/GlslShaderGenerator.cpp
@@ -82,6 +82,7 @@ GlslShaderGenerator::GlslShaderGenerator() :
     registerImplementation(elementNames, GeomPropValueNodeGlsl::create);
     registerImplementation("IM_geompropvalue_boolean_" + GlslShaderGenerator::TARGET, GeomPropValueNodeGlslAsUniform::create);
     registerImplementation("IM_geompropvalue_string_" + GlslShaderGenerator::TARGET, GeomPropValueNodeGlslAsUniform::create);
+    registerImplementation("IM_geompropvalue_filename_" + GlslShaderGenerator::TARGET, GeomPropValueNodeGlslAsUniform::create);
 
     // <!-- <frame> -->
     registerImplementation("IM_frame_float_" + GlslShaderGenerator::TARGET, HwFrameNode::create);
diff --git a/source/MaterialXGenMsl/MslShaderGenerator.cpp b/source/MaterialXGenMsl/MslShaderGenerator.cpp
index 9511fac7ba..d886d43e96 100644
--- a/source/MaterialXGenMsl/MslShaderGenerator.cpp
+++ b/source/MaterialXGenMsl/MslShaderGenerator.cpp
@@ -86,6 +86,8 @@ MslShaderGenerator::MslShaderGenerator() :
     registerImplementation(elementNames, GeomPropValueNodeMsl::create);
     registerImplementation("IM_geompropvalue_boolean_" + MslShaderGenerator::TARGET, GeomPropValueNodeMslAsUniform::create);
     registerImplementation("IM_geompropvalue_string_" + MslShaderGenerator::TARGET, GeomPropValueNodeMslAsUniform::create);
+    registerImplementation("IM_geompropvalue_filename_" + MslShaderGenerator::TARGET, GeomPropValueNodeMslAsUniform::create);
+
 
     // <!-- <frame> -->
     registerImplementation("IM_frame_float_" + MslShaderGenerator::TARGET, HwFrameNode::create);
diff --git a/source/MaterialXTest/MaterialXGenGlsl/GenGlsl.h b/source/MaterialXTest/MaterialXGenGlsl/GenGlsl.h
index 8d3e8c8720..9db87197f1 100644
--- a/source/MaterialXTest/MaterialXGenGlsl/GenGlsl.h
+++ b/source/MaterialXTest/MaterialXGenGlsl/GenGlsl.h
@@ -52,7 +52,7 @@ class GlslShaderGeneratorTester : public GenShaderUtil::ShaderGeneratorTester
         whiteList =
         {
             "volumeshader", "volumematerial",
-            "IM_constant_", "IM_dot_", "IM_angle", "IM_geompropvalue_boolean", "IM_geompropvalue_string",
+            "IM_constant_", "IM_dot_", "IM_angle", "IM_geompropvalue_boolean", "IM_geompropvalue_string", "IM_geompropvalue_filename",
             "IM_light_", "IM_point_light_", "IM_spot_light_", "IM_directional_light_"
         };
         ShaderGeneratorTester::getImplementationWhiteList(whiteList);
diff --git a/source/MaterialXTest/MaterialXGenMsl/GenMsl.h b/source/MaterialXTest/MaterialXGenMsl/GenMsl.h
index eea7b86acb..c159919773 100644
--- a/source/MaterialXTest/MaterialXGenMsl/GenMsl.h
+++ b/source/MaterialXTest/MaterialXGenMsl/GenMsl.h
@@ -71,7 +71,7 @@ class MslShaderGeneratorTester : public GenShaderUtil::ShaderGeneratorTester
         whiteList =
         {
             "displacementshader", "volumeshader", "surfacematerial", "volumematerial",
-            "IM_constant_", "IM_dot_", "IM_angle", "IM_geompropvalue_boolean", "IM_geompropvalue_string",
+            "IM_constant_", "IM_dot_", "IM_angle", "IM_geompropvalue_boolean", "IM_geompropvalue_string", "IM_geompropvalue_filename",
             "IM_light_", "IM_point_light_", "IM_spot_light_", "IM_directional_light_",
             "ND_surfacematerial", "ND_volumematerial"
         };
diff --git a/source/MaterialXTest/MaterialXGenOsl/GenOsl.h b/source/MaterialXTest/MaterialXGenOsl/GenOsl.h
index aa84a62218..d36c571a82 100644
--- a/source/MaterialXTest/MaterialXGenOsl/GenOsl.h
+++ b/source/MaterialXTest/MaterialXGenOsl/GenOsl.h
@@ -64,7 +64,7 @@ class OslShaderGeneratorTester : public GenShaderUtil::ShaderGeneratorTester
         whiteList =
         {
             "displacementshader", "volumeshader",
-            "IM_constant_", "IM_dot_", "IM_angle", "IM_geompropvalue"
+            "IM_constant_", "IM_dot_", "IM_angle", "IM_geompropvalue", "IM_geompropvalueuniform"
         };
         ShaderGeneratorTester::getImplementationWhiteList(whiteList);
     }