building back chk files windows?

at the moment there seems to be a load of .chk files on it...the files range from 32k (so I guess not much multimedia stuff on them) to about 4 gig.

Windows (of course) cant see these files via explorer - but i noticed when i plugged the drive into an ubuntu box i see all the check files. Oddly enough if i run acronis disk director via windows i can see the files - but the program cannot seem to build them together.

so next step was to copy the files to a usb drive and plug that into a ubuntu laptop. when i play the check files through a player such as vlc media player (on ubuntu) - i get SOME video. which is obviously a lot better than nothing...

..but now at the moment i've got around 10,000 of these check files - and i figure at least 1,000 are check files for video.

but the chk files have numbers for filenames e.g. 3454.chk. There doesn't seem to be a way of intentifyling what file they were originally.

so my questions are

1) is there a way without playing the checkfile to see what file it was originally.

2) and i think this is the key one...once i get a group of files that make up a video - how do i link them. Im NOT sure the pieces are sequentia so the numbering system may not workl (do correct me if im wrong)- so i've got this feeling if i simply change them to .avi files and use an avi joiner this will NOT work...

i've tried using the various 'chk file' conversion programs avaiable on the net - as well as using acronis disk director - which was of absolutely no use.

any suggestions would be much appreciated. this is my entire multimedia collection - so i'd be grateful for any pointers. i think i will eventually reformat the drive to ntfs - but would like to get as much usable information from the disk as possible.beforehand.