>Quick search on the web shows that the resulting string is quite long. If I don't find anything else, this should work. Too bad that this function does not have an overload to make the string shorter.

Actually, I would prefer to have a much longer one as it would solidify its uniqueness. Chances are in the billions, but some have reported to have obtained a similar value once. Recently, I had a situation. We are still investigating on it. I would assume it should always be unique but you might read a lot of interesting content about it by searching on the GUID uniqueness.