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
With the addition of the C/C++ extension to Visual Studio Code, you might have what is needed in a small, cross-platform editor.
Explore how to access the data from a JsonResult object and display it in a browser. An example is given so you can follow along.
Learn what GUIDs are, how to randomly generate GUIDs, and how to copy them. Examples are given both in C# and VB.NET.
Onion Architecture addresses the challenges faced with 3-tier and n-tier architectures, and provides a solution for common problems.