.IDEPLUGIN File Extension
What is an IDEPLUGIN file?
Plugin used by Apple Xcode, an IDE used for developing iOS and OS X applications; stores resources that provide capabilities to Xcode; examples include application interface elements, iCloud functions, and a PDF viewer.
To install IDEPLUGIN files, place them in the ~/Library/Developer/Xcode/Plug-Ins directory. Restart Xcode and the plugin will be available.