Given the following facts, I'm dropping support for MingW32 compiler:

- Old type definitions didn't work in ANY of Ming compilers, including w64, anyway, so it wasn't originally supported.
- Windows' macro types work for everything but MingGW32.
- MingW-w64 has also a 32 bit compiler (which is supported). Sadly, it assumes you use something newer than a Pentium Pro.
Some forgotten changes. Go back to the original code for handling compressed files.