FAT-Gopher is an old-fashioned Windows Forms application. It was a course project during my first year in university in 2008. I thought sharing its code would help others to satisfy their curiosity about FAT32 internals. Please don't suppose to face a very well-architecture source code, but I believe it's still really readable if you know one or two things about FAT32 Format.
If you want to go for a dip in FAT32, Microsoft FAT32 Whitepaper is a must-read.