Files that contain the .application file extension are most commonly associated with the ClickOnce technology that was created by Microsoft. These files are saved in the XML format.
ClickOnce is used to deploy Windows Presentation Foundation-based software or Windows Forms. The files contain application deployment information and are created to allow for "one-click" start-up of various Windows applications. The APPLICATION files may also identify the attributes that are used for the updates of the associated application.
An APPLICATION file is similar to a Java Web Start file, however, APPLICATION files are for the Windows operating platform instead of the Java computer platform.
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If you have additional information about the APPLICATION file format or software that uses files with the APPLICATION suffix, please do get in touch - we would love hearing from you.