64 bit version of API StringFromGUID2

I am trying to make a class module compatible with 64 bit Excel. I cant find a 64 bit version of the API below. Can anyone pls help?

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AFAIK, only the first and second arguments would be LongPtr as they are pointers; the third is just a Long, as is the return value.

Thank you all for your contributions.

Unfortunately I wont be able to test them. The workbook containing the class module is issuing System Error messages and cant be saved. Rather than risk corrupting any other projects, I wont attempt to recover the class. (Instead I restored a backup prior to these changes and have removed this class and any calls to it)

@Kyle - to answer your question - the class module was 'other persons code' - I didn't (don't) know what the module was doing with this API call. (I hesitate to replace working code with an alternative method when I don't fully understand what it is doing)