This script won't work, for a number of reasons(As you've probably found out for yourself).
Have a look
here, this could at least help you with selecting random files to copy.
At present, the script will copy all files from one directory to another and apply the default 999 prefix to each of them.
I would recommend against copying files. It will consume more system resources and time than simply moving them(Copying reads and subsequently writes a new file to disk, moving simply appends the
MFT).
For the deletion you'd have a while loop or something similar to check if IL2 is running. When the loop ends you can move the file you used back to the Radio_Source dir.
Moving does present the problem of filenames, as you'll end up with "999_999_999_artist - song.wav" after a while. You can either remove the first 3 characters from the filename(This assumes all files in the source directory already have a prefix) or count the characters before the first underscore and replace those.
I'm also wondering about "RunWait,%GAMEPATH%\IL2_RadioRandomizer.vbs,%GAMEP ATH%,Hide".
To me this looks like it would spawn an infinite(or however many fit in memory) number of scripts all waiting on each other to finish.
As for detecting the currently playing station, that's another difficult proposal.
The console doesn't log songs or directories, and the onscreen messages aren't logged either as far as I know.
You can however use the console command "music" without any parameters to return the currently playing file. If you combine that with the log file you could rig something up.
Writing to the console is cumbersome though.
If I could I'd give you the code, but as I've stated before: While I get the logic behind it, putting it into practice is the hard part.