SharePoint File Path Issue %Username% or %Userprofile%

Hello Everyone, 

I am new here. We developed a tool for a client that uses Autodesk Revit. This tool needs to access some files from the server. It works well. Now these files are moved to SharePoint and as you know the Desktop app file path will have a username in it too. We have to distribute it to 100s of users and I am not able to understand what should I replace the user name with so that the system can automatically access the folder. I already tried %Username% and %Userprofile% but I get errors. 

Could someone help me out here?