Guid string should only contain hexadecimal characters

Question

What is wrong exactly with this Guid? I get the error in the subject.

531fe55b-9qa5-4be3-af52-112e5adqe7a7

I am very sure that it was generated through .NET from the beginning.

Answer 1

The problem is that it contains the letter q.

531fe55b-9qa5-4be3-af52-112e5adqe7a7
          ^                    ^

This is not a valid hexadecimal character.

Answer 2

A guid should not contain any q

Answer 3

From a quick trawl (about validating a Guid):

How to validate GUID is a GUID

Basically, you can only have hex characters in a Guid, so the 'q's in your GUID above are not valid.

I sincerely doubt that this originally came from the framework.