Poorly compressed filetypes - split rar extensions

[falcorr]

Is there a simpler way to flag split rar files, e.g. r01, r02, r03 ... etc, as poorly compressed without manually typing in r01 to r99?

[Aptronymist]

Is there a simpler way to flag split rar files, e.g. r01, r02, r03 ... etc, as poorly compressed without manually typing in r01 to r99?

I'm no programmer, but as a former miscellaneous IT guy, I can tell you that almost files have headers at the start that identify them, that would be the go-to place rather than by file extension for something like that.

Info: here and here

[Masamune3210]

Trid is a really useful tool to detect magic patterns and magic numbers as they are called, it also has a database already compiled of a lot of files submitted by the community that might be useful if you go down the path of file identification using magic numbers