This is my first feature request, as I think it's not really a bug. Since the newer Open- or Libre-Office does not use the sxw (and other) extension, but the new OpenDocument extensions ods, odt, .... are still not reconized by the mime.pm-file. The same problem occurs also for the MS Office 2007+ files like docx, xslx,... . There are several other file types missing in my opinion, but I think these are the most needed ones. Maybe there can be an option to include an additional user defined mime.pm-file.