* Fix UnicodeDecode errors when logging, especially on windows systems.
Closes: GH bug 170
* Added support for WIM (windows image) archives with 7z.
* If the MIME database cannot detect the file type, check again with a lowercase filenanme extension.
* Use 7z option -aou to rename files when extracting instead of overwriting them.
* Use rar option -or to rename files when extracting instead of overwriting them.
* Use rar option -kb to keep files when extracting broken RAR archives.