OCP CAB Manager sucks!!!
It is only good for opening other .cabs, if you want to extract something out of it... and it costs lots of MONEY for such a crap...
Use Cabwiz instead. It is free as it is part of the PocketPC SDK.
You will need to create .inf file, where you can specify, what should be copied, to which location and so on.
below is zipped version of one of my apps as a sample. :o)
Once you have your .inf ready, simply drag and drop it onto CabWiz icon...
) is a perfect guide, how to write .inf files for CabWiz....