So some guys want to know how to add a non steam game to steam, mainly so they can take screenshots.
Its pretty easy actually;
*click* games on the top bar
in the drop down, you should see "Add a Non-Steam Game to My Library...", *click* on that, pick the game from the list and you're done.
NOTE: If the game doesn't show up on the list, you'll have to manually browse for the exe. file.
I'm not sure if I went with the default installation folder (I think I did) but it can be found in...
"C:\Games\Piranha Games\MechWarrior Online\Bin32\MechWarriorOnline.exe"