I'm using the latest edition of PortableApps Launcher and found this bug when developing Dolphin Emulator Portable. When I set "RunAsAdmin" as try (needed in Dolphin), the main executable Dolphin.exe gets the argument "UAC" passed to the program executable, in case of Dolphin, making the emulator won't open, only showing "unknow command line argument" message...
The current workaround I'm using is calling the main executable through a BAT file, however this is weird and break passing of real CLI arguments through the launcher...