If you downloaded BiaB ..
Are these files that appear like Realtracks actually the Realtrack installers? If so they will be EXE files that usually have multiple track sets in the name.

If they indeed are the installers (and you've installed them), you can safely delete them, as they are available in your PGMusic account under downloads moving forward if you ever need them again.
If worried check your account in the store section.

It's good to know you have this option; if you ever inadvertently delete something you bought you can get it back.


Make your sound your own!
.. I do not work here, but the benefits are still awesome