Battlefield 1942 Key Good How Can You Find Your Battlefield 1942 CD Key?

How can you find your battlefield 1942 CD key? - battlefield 1942 key good

I installed Battlefield 1942, but cand find the CD key is not. Already installed on my PC, it is a way I can know what is in one of the files in any way? The need to link veteran BF: Bad Company, any suggestions?