The ADIUMICON file extension is associated with the Adium instant messaging client for Mac OS X.
An *.adiumicon file contains saved icons for the program.
How to open:
Use Adium to work with the *.adiumicon files.
How to convert:
As far as we know, this .adiumicon file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.