Calling unmanaged dll from VB .NET

[Asad Hussain]

I have a dll (written in PowerBasic) which I need to call from VB .NET. I dont want to rewrite the dll in .NET. So I decided to add a reference to the dll by adding a reference to it. .NEt wont let me add the reference to the dll regularly. how do i call functions in this dll?? P.S. It is not a COM dll, just a regular dll.