How to install .cab files?

Hallo.
So there were a lot of programs that were only available as .cab files.
How do i install them since there were a lot of funcions (activesync or installing .cab files for example) disabled in the OS?
Any chance of getting a manual describing which WinCE functions were available or (even bettter) disabled?
Regards
Jürgen
So there were a lot of programs that were only available as .cab files.
How do i install them since there were a lot of funcions (activesync or installing .cab files for example) disabled in the OS?
Any chance of getting a manual describing which WinCE functions were available or (even bettter) disabled?
Regards
Jürgen