I've always had to use a program that does this stuff for me, but I'd like to just make my own program that does this. I've already got the individual bitmap images of the 3 sizes (16x16, 32x32 and 48x48) for the icon file and I usually find use some shareware program to create the icon file from the multiple bitmap images for me but I'm wondering if it's possible in .Net to create an icon file (*.ico) that contains multiple physical icons in it.