Files with xap file extension might also be potentially found as old scripts for Xbox 360 video console. Not related to later Silverlight or XACT packages.
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.XAP file extension - Xbox dashboard script
What is xap file? How to open xap files?
File type specification:
The xap file extension seems to also be the Xbox 360 video gaming console from Microsoft and used for some kind of script that was part of the original operating system.
Unfortunately, we couldn't find more information and it may be possible that this file type is no longer used. But it looks like that this file type is not related to later Silverlight or XACT packages.
This xap file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.
