We create .psd files with Gimp 2.10 and Autodesk Sketchbook 8.6.0 running on Windows 10. Windows File Explorer and XYPlorer file manager do not show thumbnails or previews of these .psd files. Several forums pointed to the FastPictureViewer Codec Pack as the solution to this problem. We Purchased and installed the FPV Codec Pack in early 2019. It does not generate thumbnails or previews of our .psd files. Emails to the program author receive no response. There is an FPV user forum, but no activity for a year. If FPV Codec Pack does anything, it is not anything we have been able to observe.