I've been reading some older posts about this topic, but I couldn't find one that describes exactly the problem I'm having right now.
I have Windows Vista, and I tried to open an .itd file in SDLX Lite 2003 but the following message pops up:
"Unexpected File Format"
It might as well be that the ITD file was created in a later version of SDLX Elite (I think it was called Elite a few years ago), and SDLX Lite 2003 can't read it. Or maybe it's a regular ITD file which can't be opened in SDLX Lite at all.
I know it does not help, but I hope it explains things a bit.