That was while scanning media, I didn't get as far as mixing a playlist...
The files I suspected are part of a freely downloadable album:
I just unpacked that .zip, didn't alter the files, so I propose that download rather than uploading it again.
BUT: as I said before, the crash is not exactly reproducible!
AND: After trying and re-trying several times (~10x, restarting Winamp every time), then importing the folder with these files only (worked), then again resetting the library ("Clear Media Library") - now it does scan everything alright!? Are there remnants of the media library, even after the cleaning?
Seems that's making it all just more complicated, but maybe the info helps...
P.S.: Yes, someway in this I installed the patch, but there was no immediate effect Winamp was still crashing after that.