Piglet

This is useful for linux as well. File/folder association KDE5 (picture).

It does not have to be perfect (in my opinion) . Some examples, help, ideas : simplest, which helps you to insert paths and filenames in the command line : https://ostechnix.com/drag-and-drop-files-and-folders-in-terminal-to-print-their-absolute-path/ SpaceFM implementation, Archive Handlers : Another implementation : https://www.pling.com/p/998333 Translated with www.DeepL.com/Translator (free version)

For example WinCryptHashers.xx.dll + WinCryptHashers.ini. ReadMe.txt : "WinCryptHashers.ini is a plain-text file that allows you to configure the plugin."

Use .ini file. If I think correctly, there is no limit to that. For example x=30-100 user definied lines. (23-29 reserved for original codec.)

No better results. I don't know what missing. Spectre/meltdown/vulnerabilities fix worse results ? (BIOS:Update Intel Micro code for security vulnerabilities)

i5-6500, DDR4-2133-15-15-15-35, Win7 x64 home

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+1 vote only 7z + zstd format. It is possible to gather experience. Backward compatibility does not matter for me. Look for the most sympathetic implementation.