[Solved] Run Outlook script calling C++ dll using Rules & Alerts

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C++

Outlook

I created a rule to run a script in outlook.
When a message is received with a certain subject, I want to run a task and then send an email to the sender with the results.

When I try to run the C++ dll, it says file not found. Do you know what the issue is? Note that C:\Addins in also in the path and I've double checked the file name.

Outlook VBA declaration

Private Declare Sub Test_Outlook Lib "C:\Addins\Outlook_Automation.dll" ()

Sub Test()
    Call Test_Outlook
End Sub

C++ code

void _stdcall Test_Outlook() {
}

UPDATE:
Solved by OP himself. Posted as a comment.