That's the thing that's so confusing to me! I was using libs when I wrote the C++ library, and it seems like they're being copied into savemat.dll, since it's only like 20 lines of code, but it comes out at 220KB. I'm really confused that depends would have dlls listed as dependencies of my dll since i didn't link to any dlls. I'll have to double check all of this, so I don't look like a huge idiot... X|