LaunchServices contains a big, long list of all the Applications, and which ones accept documents of which type.
Basically, OS X LaunchServices is how an application is found to run when you double-click on a document. If the program is in /Applications, or you launch it at least once, then LaunchServices should detect it. LaunchServices contains a big, long list of all the Applications, and which ones accept documents of which type. So if you have an Application that is not “registering” correctly with LaunchServices how do you check it’s information? Try this in the Terminal:
/System/Library/Frameworks/ApplicationServices.framework/Versions/A/
Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -dump
You should be able to copy and paste that, thanks to the backslash. But if you can’t, just make it one long line with no added spaces. This command will list all LaunchServices information. The output will look something like this:
B00001572 APPL/ddsk Thu Aug 5 21:25:59 2004 DiskImageMounter.app
-pad----hn---s--A---- v76.4.0 DiskImageMounter
Contents/Resources/diskcopy.icns com.apple.DiskImageMounter
Contents/MacOS/DiskImageMounter 12556, 1728655, Mach-O
V00000008 /System/Library/CoreServices/DiskImageMounter.app
C00001344 NDIF disk image
viewer, default, apple, Contents/Resources/diskcopy-doc.icns
.ndif, 'dimg', 'hdro', 'rohd', 'hdcm'
C00001351 NDIF disk image segment
none, default, apple, Contents/Resources/diskcopy-doc.icns
.imgpart, 'dseg'
....
The B entries list the programs’ basic info (in this case, for DiskImageMounter.app). The C entries below that show which file types the program will accept, with both a description and a list of extensions. So there you have it; everything your machine know about. But the question is … how do you clean out all the applications registered on unmounted DMG volumes which show at the end of the list?
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