Hi Sylvain!
Thank you. Somebody adviced me playing OMF files with
http://zakalwe.fi/uade/ , but after your reply I think it will not work. Actually I haven't checked this program yet, only the documentation.
I took a look at the binary files, and they look quite ''regular'' music files, but unfortunately I am not too professional in these formats - and I never was. Once I coded some parts in an S3M player in assembly, but my routine/knowleage already almost gone.. But the header + patterns + 8bit instruments are clearly visible.
I remember about 10-15 years ago I've ripped instrumenst from jangle.exe with a simple cut tool

Anyway, thanks everything again!