[F] Export can mistake folder for file


If File | Export's Export filename format string (e.g. %_folderpath%) yields a folderpath, Mp3tag mistakes it for a read-only file and says e.g.:

The file "D:\Audio\editing\Mp3Tag export info test'
is a read-only file.
Shall Mp3tag disable the write protection of this and
any following read-only files?

[F] Export 'disable the write protection' cancel gives faulty dialog

The current Development Build v2.40a should give a better error message.

Thanks for pointing!