If you have modified something in the .jam perhaps something have gone wrong and therefore it won't work. You'll have to tell what you have done in order for anyone to help you.
If you mean that you don't get the python version of the extractor, I can help you: The python version takes command line parameters or arguments(I don't know exactly what they are called.) That means that you will have to right click on the file you want to extract, then click open with and then choose the extractor. This way the command line arguments are filled and the program knows which file it has to open. You could also drag the file you want to extract onto the .exe file, and the program will also know which file it should open.
If you launch the program from a command line you could write the arguments after the path for the program, therefore it is called command line arguments(or parameters).
EDIT: Oh, and don't right-click on the file on a location where you have to have administrator rights. Don't drag the file from such a location eather, if you do it won't work, unless you run the program as administrator of course. [End of edit]
If you mean python, the language, I can't help you.
I hope it was helpful!