I think you can compile the dll without CVI. You have the .c and .h files and LabWindows is ANSI C. You might want to look at other dependencies to see if you need any other lib. You could also ask someone on the CVI forum to create it for you. I have LabWindows but not on this computer. If I have time and can get to the pc where I have CVI, I might give it a shot but I can't promise anything.