How to pass the String in which the file is located to the VBA method from .Net?

Question

.NET

The situation is, there is an API made in VBA, it has a method to which you need to transfer the file.
In VBA it looks like this:
Dim ff As String, Scan As String
Open App.Path & "\ScanNotaryActs.tif" For Binary Access Read As #ff
Scan = Input(LOF(ff), #ff)
Close #ff
in API- Scan is passed to the function.
How to reproduce this on .Net? (C# ideally).

Answer 1

It was decided by washing down the VB library from which the API is called.