How to Open an XSN

Files with the XSN extension were created in Microsoft InfoPath. InfoPath is software for creating forms, and the XSN file is the template for a particular form. The designer creates the template by combining several other file types and compressing them into an XSN. You need InfoPath to open it.

Medical History
An XSN file is a blank form, created in InfoPath.
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Opening XSN

If you double-click on an XSN file and you have InfoPath installed, the file should open in the program. If not, you may be able to find a stand-alone version of InfoPath for sale through Amazon or other online retailers. Microsoft's most recent version of the software is only available in the mid-size business edition of Office 365. Microsoft says it's retiring InfoPath but will keep supporting it at least through 2023.