PsfTooling is the free tool to work in conjunction with the Microsoft MSIX Packaging Tool. [Download_Page]
Release 6.11 Notes
This release includes the TMurgent branch of the PSF Version 2025.01.02. The previous version was from April so there is a lot in here just from the PSF. The relevant release notes for the PSF include the following:
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TMEditX Editor is the licensed and much more capable tool for fixing up MSIX packages, better than PsfTooling since it doesn’t have to depend on the Microsoft MSIX Packaging Tool to create the final package.