If your tif opens in quicktime..Then in explorer press your shift key while pressing the LEFT key of your mouse (pointer) and chose for "open with" ..there you can chose or browse to the program you want to open the file with.
In that menu you can also chose that the extention "*.tif" will always be opened with the chosen software.
other methode to open the file is oofcourse open the grafic program first and then open the file from within the program itself.
a Tif is a not compressed grafical file that can be opened with the most grafical programs. I did not wanted to put it here in an allready compressed and so lower quality picture.
I hope you can make it to work
by the way, i've allready been a few times on the TC servers and one of your cops also drives in our league (Bjoerk)