The quick answer is no.  However, if you have an operating program to
display the files, and the data files were written as records from an
array, it MIGHT be possible to get the file format from examining the
raw file and then write code to read the file.  

How important is it?

You could generate hex dumps, which are, technically, ascii or text files.  But
probably not what you're looking for.

Call in rent-a-geek.  You need someone who is comfortable reading hex dumps
and then writing file conversion programs.

If you still have the executables, I would back up your data files then either erase
all your data using whatever functions are in your software, or delete the files and see
if the software generates new "base" files.

If you know the dimension of your data arrays, that may help also.

Then add an element at a time and see what changes occur in your data files.  That
will start giving your an idea of the file format.  After each small run and data change,
re-examine your data files.

If you can't start with simple, base, files, you could experiment with changes in existing
fields, then finding the difference.

If you don't have the executables, or at least human readable hardcopy of some of
what's in the data files, your in rough shape..  Sorry.

I think we'd all be interested in how you make out on this...

hth