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This "blank Quicklook image" Bug is caused by the activation of the undocumented TextSelection-Feature. As soon as I deleted that feature with this terminal command the blank images were never seen again ;-) defaults delete QLEnableTextSelection; killall Finder; If this delete-command doesn't work for you, you could try to disable the ...


Download a release of qlstephen from Github, and load it into the /Library/Quicklook or ~/Library/QuickLook folder. Then, restart the Dock. I use this all the time when previewing JSON files, and it works great.


I've uploaded QuickLook and Spotlight plugins here: . These allow Finder to display thumbnails, static previews, cover art and metadata for most types of video files, including .asf, .avi, .flv, .mkv, .rm, .webm, .wmf etc.


Try: defaults delete QLEnableTextSelection; killall Finder


Isn't QuickLook enough? You could also try to upload them on Google Docs.


A temporary solution is to press ALT (twice) when presented with a grey image.


From the CLI qlmanage -r will reset the Quick Look cache.


It looks like all the previous answers to this question are completely uninformed. I suggest that you completely disregard all of them. It is unlikely, for instance, that telling the document creator that what they did was faulty will really get you anywhere. First, it's likely that they did not embed fonts, yes, but there are many fonts that carry flags ...


also installable via brew cask install qlstephen


I don't think Snow Leopard did that by default, you most likely had a QuickLook plugin installed, such as qlcolorcode or colorqc2. You can simply install this again in Lion.


Yes Thilo, there is a way. It will require a bit of command line wizardry though. As long as you're not allergic you can do the following: Open Change directories to the location of the file you want to view using QuickLook. For example, if the file you want to view using QuickLook is on your desktop you would type: "cd ~/Desktop" (no ...


Quick Look won't let you do this. Mainly because the core audio/video stuff behind quicktime doesn't support it. The easiest way to do this would honestly be to use VLC. This supports both file types you mention. The other way is to check out Perian, which gives you a bunch of extra codecs. Personally, I would try the VLC way first. You won't be able to ...


It seems this fixed it for me: defaults delete QLEnableTextSelection && killall Finder I turned text selection in the Quick Look Window on a long time ago. After disabling it, the bug is gone


It's not that the defaults write command fails. I verified the file, and it wrote the variable to it. The problem is somewhere in the design. Maybe they have moved it? I have been looking in the containers and other files but no luck yet. I hope they didn't completely kill it. Maybe there is a way to copy the old Yosemite version of QL back? If I ...


You might consider simply using QLStephen which will add proper QuickLook support for all text files regardless of their extensions. It will also properly handle files without extensions (e.g. README, Makefile). What I like about it is that you don't have to maintain a list of extensions; QLStephen detects text files automatically. QLStephen is independent ...


Actually, Xcode 3.x included a Quicklook plugin for source codes. With the intruduction of Xcode 4.x, such plugin has disappeared. I have personallly tried to use qlcolorcode and colorqc2 on Lion, but both are not stable/reliable enough (slow response, sometimes missing quicklook). An updated version of the plugins would be welcome.


Well, Better Zip does a fair job.


Open Terminal, type: sudo nano /System/Library/Sandbox/Profiles/ This will open the nano editor with the rules file. Scroll right to the bottom of this file and enter: (deny file-read* (regex #"^.*\.mkv$")) After this do Ctrl-O and then Ctrl-X to save and exit the application. Reference:


You can open Word documents with the built-in TextEdit app. It will display and print them the same way (as far as I can tell) as QuickLook does.


Take a look at the QuickLook Stephen plugin referenced in this thread: Great Quick Look plugins It opens almost everything I throw at it (as long as they are text based).


Try Adobe Reader for Mac. Sometimes Preview is not a perfect substitute for that.


Sorry to be the bearer of bad news, but native support of FLAC in Mavericks is near non-existent. Your best bet would be to just convert your FLAC to ALAC, or Apple Lossless Audio Codec. You can download the free utility XLD, or X Lossless Decoder, to convert. Download XLD from its homepage here:


Running defaults write -g QLEnableTextSelection -bool true and relaunching applications works for me. defaults write QLEnableTextSelection -bool true only applies to Finder but defaults write -g QLEnableTextSelection -bool true applies to all applications. If it doesn't work, see what Quick Look generator handles plain text files: $ ...


"QuickTime on Mavericks" is not QuickTime anymore - it is "AV Foundation". QuickLook and QuickTime Player are based on this "new QuickTime". "AV Foundation" comes from iOS, was implemented for Mac OS X too and does not offer extensions (and will never) like codecs / plugins. As Apple says: anything else than MPEG-4 (H.264) is old stuff and must be converted....


QuickLook for these types of files works because the file type is specified in Xcode's Info.plist. In order for QuickLook to use Xcode to quick view these files again in Finder, you'll need to edit Xcode's Info.plist file. This is found by right clicking the file in your Applications and clicking "Show Package Contents". You'll find Info.plist in ...


Open Terminal, and type the following: qlmanage -m plugins This will give you a fairly long list of all your active QuickLook plugins: The types listed there might look a little strange, like Those are Apple Uniform Type Identifiers or short UTType identifiers, and there is a list of the default ones available from Apple here....


QuickLook's API is not all that great. It's meant for documents that can be displayed in a single frame, like text or photographs. There is no way that I know of (or apparently anyone else) to have QuickLook play movies. Apple obviously can, but they're clearly using APIs that the rest of us do not have access to.


Just to tie together the comments & partial answers… Current state of play [as of OS X 10.11.2] would actually appear to be "this can no longer be done". Regarding the following on QLEnableTextSelection… that one alternative will fix it whilst the other doesn't appears to be some kind of hopeful, yet unfounded, meme going round the interweb - people ...


I've had great luck with the free QLStephen plugin for Quick Look. It displays lots of other plaintext formats. Probably worth a shot to see if it will work with YAML files. You can get it here.

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