I did another test with .PNG files and .DAT files...

From my PC,
*I created a folder labled SNAPSHOT
*Into this SNAPSHOT folder I copied one (1) .png file of a certain snapshot and 1 .DAT file from a completely different snapshot...
*I put these on my SD card and inserted into my unit...

It would not display the snapshot or the thumbnail from the Snapshot and Recording view...

This tells me that the associated .DAT file is specifically for the .PNG snapshot it's attached to...

At least you still have .png that can be viewed on the PC....

Rickie