Could be a problem specific to Windows 8, I'm not particularly familiar with it or if it has any incompatibilities/known issues on XMage, so that's another difficulty.
If you've ever used command prompt you could try something. Run CMD (make sure you're using it with administrator rights) and navigate to the directory where the launcher is, using the CD command (there might be differences here with Windows 8 so instead of me telling you specifics and possibly misleading you about these commands and paths just Google any parts you might have trouble with, but basically it should go "CD C:\xxxx\xxxx" and so on). Once you get the console to the right folder run this command inside it:
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java -jar XMageLauncher-0.3.4.jar
This should run the launcher or if there are any errors it should show them now on the console.
All else failing, perhaps someone with better Java knowledge than me might be able to help you later. Like I said, Java is really out of my field and I already feel I've wasted enough of your time on something someone might be able to solve much more easily.