Hello ! I'm running a simple Python script at TCC command line prompt and, it issues this error : TCC (Sys) DLL not found : python26.dll Notice that I have python 3.4.4 installed on my PC. Also, when I run the same script from Windows Explorer it is ok, that is, the ".py" extension is correctly associated with Python. The problem is only at TCC command line. Also, should I call the interpreter explicitly , by issuing "py myscript.py" at command prompt, it also runs fine. The problem is some sort of implicit association of TCC with Python version 26. Another problem is that I can't run from inside my BTMs the @python function as well. Again, implicit association of TCC with Python version 26. Any suggestions ?