Hooks into MsgBox 64 Bit

I don't remember where I got the attached file, but it was made for 32-Bit, and at work we're running 64-Bit. I've tried to update the code, but I'm getting an error 453 message when I try to run the "TestCustomMessageBox" macro, and I don't know enough to fix it so hope someone at the forum can.

The message is "Can't find DLL entry point GetWindowLongptrA in user32".

I THINK the problem is the "A" in "GetWindowLongptrA" but don't know how to rectify that.

When I go to Debug it highlights the function at the red line below:

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Here, try attached. Replaced all instance of "Long" with "LongPtr".
Gave me message box without any error on my end.

Have a read of link for more detail on 32 bit to 64 bit conversion.
https://msdn.microsoft.com/en-us/lib...ffice.14).aspx

That's so weird; replacing "Long" with "LongPtr" is what I did as well (see the code segment I originally posted). Maybe I missed one?

Thanks so much for your help on this.