So what exactly are you trying to do with AVI files? I merely wanted to have a go at writing a bit of software to handle them, perhaps to interface with a 2D graphics handling package called PPP that I wrote (see http://www.buckrogers.demon.co.uk/software/ppp.zip ). -It is less urgent now, as I now have got something of the hang of how to make AVIeditor work. But the information would still be useful. - I found late yesterday (by UK time) that the Windows Platform AVI can be downloaded from http://www.microsoft.com/msdownload/platformsdk/setuplauncher.htm (but it looks like a LONG-ISSIMO!!!! job, and at dialup line speed would be the sort of thing to leave running while you go out for a weekend scuba diving.)