Here is a good link that explains the file format in detail.
It explains what company developed the file format,
its uses and what programs can work with this file format.
Once open in one of the programs listed you may be able to
save it in another format.
There are often additional programs and applications as well
but this is a starting point to try.
This may be a rare file type as it was not listed.
I did find some info here.
If you have further questions let us know.