Unable to add reg key in a prefix created under emulation

[m1m1k4tz]

When running muvm box64 wine reg add 'HKEY_CURRENT_USER\Software\Wine\DllOverrides' /v "d3d8" /d native,builtin /f in a prefix created under emulation I get reg: Unable to access or create the specified registry key but the same command on my x86 machine works fine, this makes installing and removing DXVK automatically harder.

[KreitinnSoftware]

Try using this with safe dynarec settings, like safeflags 2, bigblock 0, callret 0

[m1m1k4tz]

Unfortunately, with those settings I still get the same error.

[ptitSeb]

I don't reproduce this issue on my side with latest box64/box32 (using wine 9.20-tkg, or 9.22-tkg). I'll retry tomorrow on a clean prefix (I have The Settlers 3 from GoG that needs some registry keys to be imported to work properly), but it was working for me lately.

EDIT: Also which version of wine are you using (32bits, 64bits or new Wow64?)