Yahoo! Widget XML File
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What is a KON file?
A KON file contains code in the XML standard for a Yahoo! widget (.WIDGET file), a small program run by the Yahoo! Widget Engine. It stores code that defines the objects that make up the widget, such as buttons and images. Examples of widgets include clocks, calendars, countdown timers, and weather forecasters.
Yahoo! Widgets was previously Konfabulator until Yahoo! purchased it in 2005. Yahoo! Widget engine was available for Windows and macOS before being discontinued in 2012. KON files are now obscure since Yahoo! discontinued the software.
KON file location in a WIDGET file
You can find KON files packaged with WIDGET files in their "Contents" folder. The KON file is located in the same location as a "Resources" folder that stores resource files, such as images and .JS files the KON file references.
NOTE: The KON file bears the same as the widget. For example, if the widget name is sample.widget, the KON file name is sample.widget.
How to open a KON file
KON files are not meant to be opened. Instead, Yahoo! Widgets reference KON files when opening widgets. However, Yahoo! discontinued Yahoo! Widgets in 2012.
If you would like to open a KON file to view its contents, you can open it with an XML editor since it is saved in the XML standard. Some options include SyncRO Soft oXygen XML Editor (multiplatform), Microsoft XML Notepad (Windows), and Bare Bones BBEdit (Mac).