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Re:Dotfile madness by masklinn on Saturday February 02, 2019 @12:07PM (#19064120)
The classic MacOS had exactly this concept: Creator Code[0], similar to the Type Code[1] but storing a file's creator rather than its "mimetype".

[0] https://en.wikipedia.org/wiki/Creator_code

[1] https://en.wikipedia.org/wiki/Type_code

Re:Dotfile madness by wool_gather on Saturday February 02, 2019 @12:35PM (#19064318)
Good point, I had almost forgotten about those!