1.0 link Rainbow Dash Network http://rainbowdash.net/ thismightbeauser http://rainbowdash.net/thismightbeauser http://rainbowdash.net/notice/5468113 Apparently reading a binary file to a char pointer and casting to a struct is a bad thing because different architectures can insert padding between the fields to cause them to align "better" for that machine. Writing is the same. I was writing an RLE binary file (a packed bitmap) this way on x64 and reading on 6502 (Commodore 64) and I guess I got lucky that nothing exploded since all the fields were in order of descending size.