First I haven't used Win98 or DMF4 in a few years now. I'm also not sure of which version of DMF4 you're using, the plain or the
Disc Creator? I don't have my version of DMF4 DC (disc creator) installed, however can open up a
plain version that is installed with MSP8.
Next Win98 and WinXP are different, so where files are stored will probably be different.
...by clicking 'add video files' a list of projects appear...
That's 2 different things. If you click on add video files, you can only add video files, not project files. To add a
Project File which would have the extention of
DWZ, you need to select the
Existing Project from the first screen when you open MF4. If all your video files are still in the same location as they were when you saved the project, MF4 should then populate the timeline with those files. If they have been moved, then MF4 will not know where they're located and therefore can not insert them into the timeline.