Merge pull request #1176 from Triang3l/xex_exe_extension.

[Core] Treat .exe files as XEX

src/xenia/emulator.cc

@@ -228,7 +228,7 @@ X_STATUS Emulator::LaunchPath(std::wstring path) {
   auto extension = path.substr(last_dot);
   std::transform(extension.begin(), extension.end(), extension.begin(),
                  tolower);
-  if (extension == L".xex" || extension == L".elf") {
+  if (extension == L".xex" || extension == L".elf" || extension == L".exe") {
     // Treat as a naked xex file.
     return LaunchXexFile(path);
   } else {