I would try this fix, but cannot open the rar file.
Can anybody give me a hint, how to open this file
Also, from RAR - Wikipedia
Third party programs that can only read (unpack) RAR files include: WinZip (Windows), 7-Zip (multiplatform), IZArc (Windows), PeaZip (Windows, Linux), Zipeg (Windows, Mac OS X), ALZip (Windows), along with the free version of unrar (which is available for Linux and FreeBSD). Mac OS X readers include Stuffit Expander, The Unarchiver and Zipeg. Stuffit Expander is also available for Mac OS Classic with RAR support for this platform.
If you go to the second link above, all those third party programs have their own links. I'm too lazy on a Saturday to copy the links into this reply. 