FIE was an importer and hasn't been for quite a few years. No way to find out when your firearm was made unless you know who made it (most likely German or Italian) and you can find them.
It depends on which company made it.
A 22 LR caliber pistol made by Walther, it is similar in design to the Walther P99.
Nope- not possible. The P22 is a blowback operated action, and is suitable only for a low powered rimfire cartridge. A .45 requires some form of a locked breech, which the P22 does not have.
No
no
$250-$350
WC9 is cast P22.
Cost, caliber and maker.
P22 Daddy O!!
No
No
Some people use a Walther P22 for shooting practice purposes, some use just for a day at the shooting range. The Walther P22 is known for being fun to shoot and no recoil. Some use as a gun to protect their family.