IIRC, you'll need to have also the following files in the same folder as the avs DLL:
splitter.ax, mkx.dll, mkzlib.dll and mkunicode.dll. Again IIRC, register mkx.dll BEFORE registering splitter.ax.
Supposing you cannot (un)register DLLs/OCXs via Explorer's context-menu,
then open a command-prompt onto the target folder and run:
Code:
regsvr32 filename.ext
NOTICE, this does work with a "normal" Avisynth setup,
I have no idea whether it's sufficient for MeGUI, which I've never used.
Besides, you may wish to remove the Registry entries which force
the use of HMS as "THE" source filter for MKVs/MKAs.
<rant>
Haali Media Splitter is 10 years old already,
what's the point of keeping its source-code closed (or outdated)?
</rant>