So I have the old db system (accessed with a terminal emulator) that I need to export the data out of but dont know what the back-end is using. Its comprised of 3 files per table it appears. a *.S, *.I, *.D
Figure maybe someone tried to get job security by renaming the extensions perhaps. opening them with a hex editor it looks like the S is a structure file (table definition), the I file possibly an index file and the D file for the data.

Any reputable website recommendations where I could upload the files to for analysis would be great. Tried a few and always fail to come up with an answer.