I found a workaround. I guess WinUAELoader is only meant to be used with one of the databases. So I picked GameBase as it contains the largest number of games. I set the path to a newly created folder:

I looked in GameBase.xml and found the path and name for Rick Dangerous. I created Rick Dangerous.zip in the folder GameBase\R\ and launched WinUAELoader with
WinUAELoader -mode GameBase -rom "rick dangerous.zip"
Still no go. Than I tried
WinUAELoader -mode GameBase -rom "Rick Dangerous.zip"
and voila. WinUAE was launched, Rick Dangerous booted and I could move the mouse with my second joystick and quit with ESC. Thats all I need. Well... I would like the pause function of WinUAE to be mappable to a key (preferable 'P') as I try to use the MAME keyboard shortcuts for all my emulators so they all work with my admin buttons. So far I managed to remap all emulators (Odyssey 2, Atari 2600, Colecovision, SNES, Sega MegaDrive, Sjaak's Fix It Felix Jr, Flappy Bird Arcade Edition, Space Commander) via their options or with a small AutoHotKey script. WinUAE was the only one I could not succeed with but thanks to HeadKaze's WinUAELoader I finally got it working now.
