What is Cab
Cab extension is associated with Cabinet File-compressed file. You have chance to open cab files with Winrar or Microsoft CAB.
Cab extension stands for file compression method which created by Microsoft. Generally it is used in program setup files. In windows operating system, It is enough to make double click on the file to open. If it doesn`t work, you can try to read with Winrar software that can be downloaded free via various web pages.
Viewer or Converter for Cab
Winrar, Microsoft Cab
Which pages about Cab