Files that contain the .ip file extension are most commonly used by the IconPackager custom desktop theme software program.
IconPackager is used to create and save custom desktop themes that change the look and feel of the Windows environment on a user's computer. For example, if a user downloaded an "astral" theme the icons included with the theme might contain a star icon for the cursor and a background of the night sky.
The IP files that are associated with this software contain a package of icons that have been saved to create a desktop theme by this application in a compressed zip format. These themes can be purchased online or can be downloaded from freeware websites.
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If you have additional information about the IP file format or software that uses files with the IP suffix, please do get in touch - we would love hearing from you.