[Python] What is 'ilu_tk' module in Python 1.5?

I'm trying to port Grail browser to Python 3.10+. In the source, grail.py trying to import some modules like ilu_tk, filetypes etc. which are not in the Python 1.5. Can you tell me how can I get these modules?

I've downloaded Python 1.5 and Tcl/Tk 8.0 . There are no modules such these. If anyone have ever tried to port it, give me some tips.

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