Someone who runs Windows. In an environment where upgrading to SP1 is unlikely (runs on at least Windows 7 vanilla, exits on SP1 - can also be explained by assuming more sophisticated detection on SP1 boxes), yet both x86 and x64 versions are in use (two versions of binaries - so perhaps previous versions with variants?), someone who is running a particular software package the name of which is known and which follows the normal windows software installation procedures (key hash generation and the fact it's looked up from under the program files - can be a distraction though!).
I actually think that the program files path is a distraction. The actual key is a hash of a particular known file in a system, the non-ascii entry in the program files is ether a null result to be matched against or an extra test.