Windows File Explorer displays the thumbnails for various supported pictures and video formats when you open a folder containing these types of files.

Unfortunately, Windows does not support PSD images produced by Adobe Photoshop software. As such, File Explorer also does not display the thumbnail previews for PSD files which is very very difficult to select and open each and every photoshop documents if we don’t know which file to open and work on.
To View the Photoshop Documents as Thumbnail Images in Windows Explorer, there are a couple of choices you can select from.

Manual Method to View the PSD thumbnails in Windows Explorer

• Download the psicon.dll
• Copy it to the location C:\Program Files\Common Files\Adobe\Shell
• Note : if “Shell” folder doesn’t exist create it manually
• Download the PSD.reg. Run and merge it with the registry.
• Restart your PC for the changes to take effect.

Below are some of the tools that you can use to preview the photoshop files as Thumbnails

1. FastPictureViewer Codec Pack

The FastPictureViewer Codec Pack adds fast thumbnail and preview support to Microsoft Windows for many image formats, including RAW formats from more than 580 digital cameras, Photoshop PSD, OpenEXR, TGA, DDS, HDR, Maya IFF, SGI RGB, JPEG 2000 and more! The Codec Pack is compatible with Windows 10 Desktop, Windows 8.x Desktop, Windows 7, Windows Vista and Windows XP SP3 and also creates thumbnails for Google SketchUp, Adobe InDesign, Adobe Illustrator, EPS, and Adobe PDF-XMP.
Find all your images visually, directly in Windows Explorer just like JPEGs, without the need to launch any program!

2. SageThumbs

SageThumbs is a powerful shell extension allowing to preview enormous amount of image formats directly in Windows Explorer by using Pierre-e Gougelet’s GFL library.

As SageThumbs is a Windows Explorer context menu extension, you don’t need to run a Windows program for it to work. To use it just open any folder in Windows Explorer with image files to preview and you’ll see the thumbnail(s) immediately.

More Details & How To Install SageThumbs

3. PSD Codec

PSD Codec is a plugin for windows explorer which enables viewing of PSD files in windows file explorer.

4. Pictus

Pictus is an image viewer for Windows that is able to enable thumbnail previews for various image types that are not directly supported by Windows.
You can use it to have thumbnail previews of PSD image types easily.

5. Mystic Thumbs

Another application act like a plugin for windows to make the PSD thumbnails visible in the windows Explorer. Pro version of this plugin is also available with some of the extra features. Mystic Thumbs seems little bit slower in making the thumbnails of the large sized PSD files. Except that its working pretty good.