macosquicklook
[Turns out this is known bug #9536151]
I have a strange issue with Quicklook in Lion. This is on a clean install and happens with more than one user. It also isn't fixed if I clean out the Quicklook cache in /var/folders
I have to push the spacebar twice to get Quicklook to work properly.
The first time the usual Quicklook 'window' appears but it is blank:
Push the spacebar again and the image appears. If I restart the Finder the problem goes away briefly. It's driving me nuts.
You are looking for qlcolorcode. qlcolorcode allows you to have syntax highlighting in your quicklook preview:
I have Mac OS X Lion 10.7.4, and that file is present. The file is copyrighted by Apple ("3.2, Copyright Apple Inc. 2007-2011").
Looking at the content of its info.plist file, I see that its purpose is generating a preview for files with a content type UTI equal to com.apple.iconset, which (as far as I remember) is the type of files containing a set of icons.
The computer I am using is a Mac Mini middle 2011. I don't actually remember if It came with Mac OS X 10.7 already installed, or it came with Mac OS X 10.6, and then I installed Mac OS X 10.7. I have also installed Xcode.
Probably that can explain why some computers don't have that plugin, and some computers have it. It could also be the difference is caused from installed software, or an update of the operating system.
I would not say the plugin should not be there. It is not a file created from malware, or viruses to cause any issue with your computer.
Best Answer
This sounds like a bug; you can report it at bugreporter.apple.com with an Apple ID and password.
Can you reproduce the problem, then check for new error messages in /Applications/Utilities/Console.app? There's a small chance that this will indicate the source of the problem.