So I installed Adobe Premiere CS4 and the footage I want to use are in MKV format. And I found out that the AviSynth plugin that would work with versions prior to CS4, doesn't work with CS4. Now after reading this I've found out that I need to use VFAPI to make an AVI header for an Avisynth script or something like that. But when I choose "Add Job" and select my script (The script plays fine in media Player Classic) I get the message: File '[Directory to file here]' is invalid. Any idea why this would be? I followed the steps in the second post here but no luck.

Some assistance would be great
