A .CAB file is just a compression of one, or many, files. Very similar to .ZIP files.
This is from WinZip's help file: "The Microsoft CAB (short for Cabinet) format is used by most Microsoft setup programs, including those used to install Windows. CAB files provide both file compression and file grouping. You can use WinZip to open and extract the contents of CAB files."
There are at least several very good and free decompressing tools that can also open .CAB files.
TugZip at http://www.tugzip.com/
ZipGenius at http://www.zipgenius.it/index_eng.htm
IZArc at http://www.izsoft.dir.bg/
and there are others as well. Search and you will find.
i`ve seen it done befor but i can`t remember how to load them with out the windows cd if anyone can help me or tell me i would gratly appricate it thanks