I contacted the author of Omikron BASIC and he does not want to give out the information needed to decode the tokenized files. He more or less replied "use the Omikron editor". :-( It's rather irritating to get such replies when the software is unsupported since 1998. The sad thing is the author will probably take your money if you attempt to purchase it!
If you wish to import your old Omikron files into GFA-Basic, you will have to use the old Omikron editor and export the listing as ASCII, then import it into GBE.
Also, I recommend avoiding Omikron BASIC entirely. Not only does it create non-standard binaries (which are mostly data, with a small loader), but it also uses PMOVE and self-modifying code.
I've been told by more than two people that a proper Intel version for the Mac is not planned. When Rosetta is finally removed from Mac OS X, Omikron Basic will cease to function. It's only a matter of time. So buyer beware!