C# read and write image data

I have been programming a map editor to use when making 2D games. I have nearly completed it, however I can't load maps.

I have multiple options for saving and loading maps. I have:

DAT File

BIN File

MAP File

XML File

XML isn't the issue but the other file types are. I need to be able to read and write image data to these other 3 file types. I would suggest just removing these file types, but sometimes having maps that aren't XML are useful.