After you succesfully download a file shared on Myclasic, you need to Un-RAR it. You can use the following softwares, both are free to use.
1. Win RAR is an archiving utility that completely supports RAR and ZIP archives and is able to unpack CAB, ARJ, LZH, TAR, GZ, ACE, UUE, BZ2, JAR, ISO, 7Z, Z archives. It consistently makes smaller archives than the competition, saving disk space and transmission costs.
Download Win Rar Download.
2. 7-Zip is a file archiver with a high compression ratio.
Download 7-Zip Download.