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C:\path\to\factorio\bin\x64\factorio.exe C:\path\to\savegame.zip
For testing purposes, I have added an association for the "FZIP" file type to Factorio (and manually renamed some save files). However, Windows' default does not include the "--load-game" argument; so the game stops at the Main Menu. I have modified my Registry as such to add this parameter:
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Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Applications\factorio.exe\shell\open\command]
@="\"C:\\Program Files (x86)\\Steam\\steamapps\\common\\Factorio\\bin\\x64\\factorio.exe\" --load-game \"%1\""
[HKEY_CLASSES_ROOT\fzip_auto_file\shell\open\command]
@="\"C:\\Program Files (x86)\\Steam\\steamapps\\common\\Factorio\\bin\\x64\\factorio.exe\" --load-game \"%1\""

Yes, this is a very silly and niche request. Please feel free to say No if it would be hard to implement.

Thank you for reading!