I can tell you a way to do it but I will have to mention that terrible REAPER and I might get jumped on and have to leave the forum again for another 6 months

The .bt1 are just beat files like reapeaks in Reaper. The info is in the XT2 ST2 in C:\bb\Soloists.
Musocity,
I'm willing to go down this path to install Reaper, load your scripts, create frozen sgu, and extract info from temp.txt.
Before I dive in, one question though: Does it work with soloist type of RealTracks?
Last time, back in August 2023, when we talked about this, you did mention, for rhythm type of RT, you get the chord progression of the entire track, but for soloist type of RT, you only get a key, no chord info.
Is it still true with your new method?For chord/rhythm type of RT, it's polyphonic, so that I can simply use DAW's chord detection function to figure out the chord. No need for Reaper.
For soloist type of RT, because it's recorded in monophonic, DAW's chord dectection function will not work. But it takes me 5 seconds to figure out the key of the track by ear.
It is the chord info of a soloist type of RT I need to figure out.Why don't you go to the folder I mentioned, pick any wma file in that folder, and try it with your method, and see if you can extract the chord info for that entire track.