I'm wondering if there's a way to get QuickLook open up files it doesn't recognize.
For example, I'd like to be able to have QuickLook view .mailsignature files in the basic text viewer. Any suggestions?
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You might be able to open them with QLStephen which opens all kinds of files that are plain text.
I am hesitant to recommend it since it will try to open every file for which you don't have another plugin as plain text which is not helpful. It has a blacklist but I found myself constantly adding things to said list which makes it kind of bothersome to use.