Sprint 6700 pocket pc

[surlamer]

I have a Sprint 6700 mobile pocket pc with Windows 5 os. I am not using the phone per se but only the Windows os. I have synced some files from my desktop that need to be un-zipped/opened. When I try to do this I get: there is no application with this file, run the application first, then open this file within the application. Another of the files that I need to install in order to make everything work is Microsoft NET CF 3.5. When I try to open and install this I get a message that it is not a valid pocket pc application.

Is this a problem because the os is not more recent, say win 6 os? The program will not run on win 7.

I am not familiar with mobile phones at all.