Unable to load DLL

[PlausiblyDamp]

I have been documentation for a project in C++.
I'm trying to write it in VB.Net.
The project contains a DLL - FriDll.dll

I have the following code:

Declare Function FriDllVersion Lib "FriDll.dll" Alias "DllVersion" () As Integer

and

MsgBox(FriDllVersion)

I just (initially) want to display the dll version number to check I can call the dll.

But I get the message 'Unable to load DLL'

I have added the dll to the System32 folder, to the project debug folder, to the project using 'add Existing' - but still get the same error.

Looking at similar questions I have run the Dependency Walker - but wasn't sure if it showed anything missing.

Any ideas?

Thank you.

Is the DLL compiled as 32 or 64 bit? Is your VB app configured the same? Does the DLL have any other dependencies that might be missing from the system?