Another great target for JXL support: PowerToys (opensource, >90k stars on GitHub) has a module for adding explorer.exe thumbnail/preview support to file formats

• jxl-winthumb

  9 249 7.1 Rust

  A JPEG XL (*.jxl) thumbnail handler for Windows File Explorer.

Here's an issue on their GitHub. It references jxl-winthumb which uses WIC (meaning explorer.exe, the default Windows Photo Viewer, and any other app using it can then decode and display JXL). It's written in Rust (no Rust code in PowerToys yet, mostly C++ and C#) but at the very least it serves as a good reference for implementing in C++.

• PowerToys

  713 104,153 9.8 C#

  Windows system utilities to maximize productivity

  

Here's an issue on their GitHub. It references jxl-winthumb which uses WIC (meaning explorer.exe, the default Windows Photo Viewer, and any other app using it can then decode and display JXL). It's written in Rust (no Rust code in PowerToys yet, mostly C++ and C#) but at the very least it serves as a good reference for implementing in C++.

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• jpegxl-wic

  8 54 2.7 C++

  JPEG XL Windows Imaging Component implementation

By "have a WIC" I mean that searching for "JPEG XL WIC" brings up something useful (it currently doesn't in the top items and the top item is a 3yrs out of date github repo https://github.com/mirillis/jpegxl-wic), has an installable JPEG XL WIC referenced from the site (https://jpegxl.io/tutorials/windows/ says it's currently not for end users and is a work in progress), and follows the guidance in https://learn.microsoft.com/en-us/windows/win32/wic/-wic-codecinstallandreg for making the codec available.

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