How to pass header files of dll into TestStand

I have three dll-s. Each of them has their own header file. All three dll-s are using common header file.

When I try to use DLL functions from TestStand I do:

I insert Action to Main step -> Module -> Select my dll -> List of Functions appear at "Functions" drop down menu.

When I select any function it gives me Error:

"This function does not have parameters information in the DLL or uses types not recognized by TestStand"

This is beacouse functions definitions are in .h files?

How can I pass .h header files to TestStand?