Look into how the DesktopRAPIInvoker application transfers files between the desktop and the CE-side device.
Latest Files Articles
Using RAPI to Find Remote Files
Create powerful, panoramic CE file handling capabilities from the desktop side using RAPI.
Finding Files From Within WinCE Applications
Explore the techniques for allowing the user to find and access files in WinCE using the Common File dialog.
Read and Write Text Files in WinCE
[Update] WinCE did not implement the CStdioFile text file functions. Check out this article if you need to read and write text files on CE.
CCeFileFind - File Finder class for Windows CE
CCeFileFind - File Finder class for Windows CE
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With Microsoft's new Project Rome, the user experience across all platforms (Windows, iOS, or Android) will be seamless among different hardware.