GUI crashes when using header editor on a file without write permissions
I just used the GUI tool on a file on an NTFS hard drive for which I wasn't the owner and had no write permissions. When trying to save my changes I get an error message from the GUI ("Saving the modified track headers failed. The file could not be opened for writing...") and afterwards the GUI closes and I get Windows' appcrash notification.
Besides getting rid of this error it might be advisable to check whether the user has the necessary write permissions during opening the file in the GUI's header editor and inform the user about it; but given that there are at least two use cases of the header editor that don't require write permissions for the file (namely extracting attachments and just looking at the header data) it should not abort right away.