How import already existing game file to steam and verify it ?

[Tadziunia]

Yesterday i bought Battlefield bad company 2 in steam and Battlefield hardline in Origin because of black friday.  I had pirated version of bad company 2. Please don't blame me for that i sometimes download pirate version to check how it goes and only then i buy it, i have almost all series of battlefield now. Bad company 2, bf3 + premium, battlefield 4 and now hardline. So am asking how can i put already existing bad company 2 game files to steam libraly correctly ? and how to verify game files correctly ?

[Guest]

You can't.

[TheGamingBarrel]

You just move it into the game folder, then verify integrity of the game, and voila! I think.