as %_folderpath%\%_filename% leads to something like C:\Users\Abc\Downloads\Bravo Hits 114 - 2021\16 - Ti Amo - Pietro Lombardi`
(which I think is an invalid syntax because of the double backslash) but misses the filename extension, I am not sure whether your player understands that.
Or, before we go on with trial and error, the search words "tool winamp" will lead to some threads, e.g. this one:
with a further link to the FAQs