.ICONPACKAGE File Extension
File TypeIconPackager Theme File
What is an ICONPACKAGE file?
File created by IconPackager, a program used to create Windows icons; contains a raw theme for an icon package, including which packaged icons map to which Windows icons; used to save and load IconPackager themes.
NOTE: IconPackager introduced the ".iconpackage" file extension for raw themes beginning with IconPackager 5. Previously, raw themes used the .IPTHEME extension.