Question: this allows the intelligence of windows to decide the correct software application to open your ff file.
Answer: --> This allows the intelligence of Windows to decide the correct software application to open your FF file.

Question: pb - the same principles as used for category 1 must be applied
Answer: --> Pb - The same principles as used for category 1 must be applied

Question: other games like reach the copter
Answer:
--> Other games like Reach The Copter