Quick patch to allow previewing plain text files with unknown extension by simply pressing Spacebar in Mac OS X Finder.

1. Download QLStephen plugin: https://github.com/whomwah/qlstephen
2. Copy file QLStephen.qlgenerator to directory /Library/QuickLook/
3. Optionally, to allow selection of text right from the preview, copy and paste this into terminal:

   defaults write com.apple.finder QLEnableTextSelection -bool true; killall Finder

4. Restart Finder

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