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I created an app in 2018 with python and then used Cython and pyinstaller v 3.6.
I am wondering how to decompile it. I have tried uncompyle6 + pyinstxtractor however this only works for python files, not cython. There is also no known cython decompiler. I have had a try with Ghidra and IDA but no luck although I am new to it.
The .pyx file is not embedded in the .dll, Cython generates C code from it then compiles that into a .dll. You would need to treat the .pyd as a standard PE DLL and disassemble it, then recreate the python from what you understand of the assembly.
