I have lots of mp3 files, and and some of them had very long filnames ending with things like "Previously Unreleased Japanese Bonus Track", so I have manually shortend the filenames down. This means there is now longer match between the filename and titlefield in the tag. So I wonder, is it possible to copy back the new short filname, and without tracknumbers, to the titlefield in the tag?
It should be possible.
See the FAQs on the converters:
If you need more help then you have to show a concrete example of a real filename.