Look into how the DesktopRAPIInvoker application transfers files between the desktop and the CE-side device.
Latest Files Articles
Create powerful, panoramic CE file handling capabilities from the desktop side using RAPI.
Explore the techniques for allowing the user to find and access files in WinCE using the Common File dialog.
[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
Latest CodeGuru Developer Columns
Go hands on in using each of the standard library's five sequence containers.
FileSystemWatcher is a powerful tool you can employ in your .NET programming. Learn about it here. Examples are in C# and VB.NET.
Explore how to create and use a Ubuntu virtual machine.