What do you mean "open .exe's"? If by that, you mean open self-extracting archives, it may be possible to open them with Stuffit Expander or ZipIt 2.2.2. OTOH, if you want to run Windows-based applications, you may try Bochs, one of the implementations of QEMU, or [God forbid] Guest PC. However, Virtual PC is so far ahead of the competition that the battle is for second place.