Situation: 
- My RCP application uses XulRunner
 - System has two installed PDF viewers (Acrobat, Gimp) 
 - Firefox has Gimp set as default viewer 
 - I want to make my SWT Browser composite in RCP application ignore default viewer and use Acrobat if it is installed
 - If it is not, I want to use default viewer
 
Question:
- Can I achieve this by (temporarily) setting some XulRunner or System property in my application?