Re:SingleFile: Save a complete web page into a single HTML file
by tekknik on Wednesday March 02, 2022 @01:55PM
(#30531249)
Not so proprietary. It's really just a plist file, which the format is known and even open sourced by Apple[1]. Really it's only proprietary in that no other platforms have implemented it.
[1]: https://opensource.apple.com/source/CF/CF-550/CFBinaryPList....