Only the cmpro temp folder is used for tempoary unzipping operations. If you try to rebuild unzipped files it's sometimes necessary that some rename operation is done on the rebuilder source folder. If that's on a readonly medium, it will fail with some 'can't rename' errors.

The only known Runtime error appears when the temporary cmpro folder runs out of diskspace. Weirdly enough the runtime error appears before CMPro can catch any exceptions.

*edit* seems that the latest ZipArchive Class -which ClrMamePro uses- crashes if it tries to unzip a corrupt zipfile. I already contacted the author *edit*

Roman Scherzer
ClrMamePro