Whats with the code thing at the bottom of the credits?

[Macgyverthehero]

I just finished playing the total conversion mod "Gary: Dark Secrets Chapter 1" and at the end of the credits that say "The End" under it is a code or name that says something like "odn315".

So what are these code/name things about on the end of the credits?

[Adny]

They're part of the original game; its 1 of 3 parts of the code to open the super secret rar file, each corresponding with one of the alternate endings. It seems the creator of that mod didn't have the mind to remove it properly from the credits.