OK. Forget most of what I've said previously.
We've done some extensive testing on Windows and / will work!
This doesn't work on Windows 98 but does on Windows 2000 (and probably XP, 2003, etc.)
So, you can define your filters like this:
and you can define your temp directory like this:
$FILTERS = "d:/inetpub/cgi-bin/fmencoder ...";
Provided the paths are correct, this should all work.
$SCRATCH_PAD = "d:/temp";
Make sure you've uploaded the correct FMEncoder program (not a linux version, but the windows version)
If you drop into a CMD prompt you can type this to prove it:
You'll get a sensible usage message from fmencoder. If you get an error message, then you'll know what's wrong.