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For what it is worth Microsoft includes the releveant dll's in the OS to run the movies if you add these registry entries.

Tested in Windows 10 x64.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32]
“vidc.iv31”=“ir32_32.dll”
“vidc.iv32”=“ir32_32.dll”
“vidc.iv41”=“ir41_32.ax”
“vidc.iv50”=“ir50_32.dll"

The entries are strings values.

I believe it is looking for version 4.
Post edited July 04, 2022 by Marcellinus