I'm afraid Olaf is right ,mine is NOT an original cd(sorry,but its not MY fault the CD's cost so much.At least i dont lie).I guess
Serial.txt overrides some original value,and the guy who gave it to me added it.Its kinda like putting Rules.ini in your RA2 directory.

SO: you can do the same. Create your own Serial.txt file,and make sure the appropriate amount of digits.If YR requires a seial number ( not sure if it does),than you will probably need to make one for that too.

Again,post a reply and tell me how it goes.