IPTHEME, IconPackage Raw Theme File (.iptheme)
The IPTHEME System file format
IconPackager is a program used to create icon themes for Windows computers. It is the only program associated with files having the IPTHEME extension. The file contains all information the Windows operating system needs to change its visual theme according to the specifications of the file. This includes the mapping of default Windows icons to the ones they should be replaced with using a theme. IPTHEME files are used to load IconPackager themes and to save them for later application.
Technical details of IPTHEME files
The IPTHEME format extension was used up to the introduction of IconPackager 5. With this version, a new format was introduced: the ICONPACKAGE format.