If you are looking for the (specifically the one from Ardfry Imaging ), it's important to clarify that this is third-party software, not an official Adobe product. It allows Windows to display PSD thumbnails in File Explorer. Where to Find Your Serial Number
(functions.RelatedSearchTerms)
Icaros is a lightweight, high-quality set of Windows Shell Extensions. While primarily known for video thumbnails, it handles many image formats beautifully. Free. psd codec serial number name
If you want a fast image viewer to replace the clunky Windows Photo Viewer and get PSD thumbnails, this is a great two-in-one. How to Properly Register the Ardfry PSD Codec If you are looking for the (specifically the