User and Group IDs.. and where are these recorded?

I come from a Unix background, so I'm having a little trouble getting my head around this. /etc/passwd and /etc/group are apparently not used for normal user accounts in OSX. Is there a way to change the UID and GID of a user account?
The reason I'm asking is because the Mac version of Guitar Pro installs as UID and GID 501 and, on my Mac, it crashes about halfway through playing a song with:
Exception: EXCBADACCESS (0x0001)
Codes: KERNINVALIDADDRESS (0x0001) at 0x061f9f18
... and I suspect the problem is file permission related, as my main user account is UID/GID 502, and 501 does not relate to any existing user account on the system (I deleted my original account shortly after getting my Mac and created a new account for myself) .

UIDs and GIDs are managed with /Applications/Utilities/Netinfo Manager. Since you claim to have a unix background, you probably don't need to be told to not mess with any of its settings unless you know what you are doing.

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