[macOS] Pickled TWS contains improper story format name

[tmedwards]

Under macOS, at least, the story format/header name within the pickled TWS inexplicably ends with .py.

For example:

• A Windows user installs SugarCube v2 to …\targets\sugarcube-2\. The pickled story format name is, as expected: sugarcube-2.
• A macOS user installs SugarCube v2 to …/targets/sugarcube-2/. The pickled story format name is, inexplicably: sugarcube-2.py.

This breaks interoperability between OS versions.

ORIGINALLY FROM: Accessing Sugarcube story across Mac and Windows (twinery.org)

[TAG13]

Here are example tws files for anyone to look at. The only difference is line 15, where the Mac version includes the .py extension and the Windows version does not. Simpy opening up the tws file in a text editor and making the appropriate change (depending on the OS) allows the previous problematic tws file to be opened in Twine.

TwineSugarcubeExamles.zip