VirtualDub Codecs/Plugins

Hello,

I downloaded VD, and the plugins pack. However VD will not load any video file - I've tried all formats and it always says MISSING CODEC... sometimes it won't even load the file (as is the case with avi - which I get - there is no xvid codec in the pack, but how about the ones that are in the pack??). At best it would only play the audio.