Make OS X's Quick Look work for custom file extensions

QLStephen adds support for both files without a filename extension (like README) and files with arbitrary extensions (like file.xyz).

Quick Installation using Homebrew:

brew install qlstephen

Manual Installation:

Download plugin
Unzip
Move file to ~/Library/QuickLook

(Don't forget to star the repo if this plugin helps you.)

You might also want to have a look at the QLColorCode and QLMarkdown plugins, for syntax highlighting of many languages and markdown rendering respectively.

http://code.google.com/p/qlcolorcode/

http://github.com/toland/qlmarkdown/

A search for quicklook on github reveals that there is a large variety of extensions available:

iPhone / iPad / iPod Touch application icons quicklook-ipa
dot preview quicklook-dot
Display image dimensions in title bar qlImageSize
Viewing plain text file w/o extension QuicklookStephen
MultiMarkdown QuickLook Plugin
EPUB QuickLook generator and Spotlight importer
Lightroom .lrcat
Apple QuickLook Plugin for PPM, PGM, PFM and PBM files
CSV files
BetterZip overhaul
MATLAB .mat files
NFO files
Hazel rule for Auto-Quicklook
Sublime Text 2
Markdown as html
PhotoCD (coverflow) files
Autopano Pro files
WebP thumbnails and previews
Lytro's Light Field Picture files
PowerVR .pvr files
JSON files
Sony Mavica *.411
apparently custom QuickLook image suport
.hx files
FITS files
QuickCHM files
Adium Chatlogs
SQLite3
DDS files
markdown
.mdinfo files
sublime-snippet and tmSnippet
outdated zip
ePub cover pages
Haskell syntax highlighting
Drupal filetypes and more (module, profile, theme, install, inc)
Creating thumbnails via OS X QuickLook
r0ket .lcd files
audio files
PDB files
crippled iPhone png files
diffraction image data
FIT files from Garmin devices and such
PES Embroidery Files
FictionBook (fb2) e-book files
Markdown
Adium Chat Log
Windows BMP files
Go source files
Cocoa sqlite database files
source coloring
WebP image files
Netpbm files (.PBM, .PGM, .PPM, .PAM)
Dart source files
OSGi bundles
Agilent/Varian FDF formats
For files that are commonly found in structural biology
JSON, supporting fold/unfold sub-tress
iCloud CDT files: see deletes, inserts and updates
Markdown-Viewer, a viewer which provides QuickLook support as well,

and some (incomplete) collections:

QuickLook 1
QuickLook 2

It's possible, but not really easy.

If you look at /System/Library/QuickLook/Text.qlgenerator/Contents/Info.plist, you'll notice that the "text" preview is for the following UTIs:

public.plain-text
public.rtf
com.apple.rtfd
org.oasis-open.opendocument.text
com.apple.property-list
public.xml

This is how QuickLook knows which Plugin (qlgenerator) to use.

A (hackish) solution now would be to assign the extension properties the UTI public.plain-text. To do this, you could create a dummy application (e.g. created by Automator) that declares these file types like described here, only you'd use public.plain-text as UTI and properties as file extension.

Make OS X's Quick Look work for custom file extensions

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