Well, enosoft was a dead end, I couldn't get any of the files to work with it. Still can't get hold of the photographer!

I have found something else that might be significant though.

In the same folder I found some hidden files (no idea why they were hidden).

There were 7 .avi files named Part 1.avi to Part 7.avi, each between 200MB and 500MB. The curious thing is that they do not contain any video, just audio that is clearly from the wedding.

Running them through GSpot confirms that 99% of the size of the files is audio data (for example, Part 1.avi has 3.99MB video and 426MB audio according to GSpot, roughly 58mins in length).
GSpot says the video codec used is CDVC - Canopus DV Codec, audio is PCM Audio.

I tried playing them through VLC and VirtualDub, but I get only audio. Media Player Classic won't play it at all.

Is this significant? Do the part files need to be joined to these avis in some way?