python -m PyInstaller.utils.cliutils.archive_viewer your_program.exe If the cookie is only slightly corrupted, you can manually locate the archive. Write a small Python script to find MEIPACK2 and extract data.
pyi-archive_viewer dist/myapp.exe --list If this fails, your build is broken. Document the PyInstaller version used for building. Keep extraction tools in sync. C. Avoid Binary Modifications Do not run UPX, strip , or resource editors on the final executable unless absolutely necessary. D. Use --log-level=DEBUG During Builds Verbose logging can reveal if the cookie was written correctly: python -m PyInstaller
Example:
from PyInstaller.archive.readers import CArchiveReader reader = CArchiveReader('your_program.exe') reader.extract('output_dir') Many users report seeing the word "top" in the error traceback: Document the PyInstaller version used for building
This error typically surfaces when you try to , analyze , or modify a PyInstaller-generated executable using tools like pyi-archive_viewer , pyinstxtractor , or custom extraction scripts. It indicates that the tool cannot locate the expected PyInstaller "cookie" (a magic string and metadata chunk) inside the file, or that the archive version is incompatible. Avoid Binary Modifications Do not run UPX, strip
with open('your_program.exe', 'rb') as f: data = f.read() idx = data.find(b'MEIPACK2') if idx != -1: print(f"Cookie found at offset idx") # Extract logic follows... If the executable is wrapped with UPX (common for PyInstaller), decompress it first:
A typical cookie structure (Python pseudo-struct):