When browsing the folders with tons of images using Windows File Explorer, do you see application-based icons for different file formats and no preview in the preview window like in the image above? Then, I have a solution for you! And, it is highly affordable. If you could view the images in Windows Explorer, you could maintain the files more easily, you could pick the correct file and drop it on an application to open it and in general be a lot better informed about what is where on your storage drive.
In the earlier incarnations of Windows, Microsoft used to provide a downloadable CODEC pack that would allow viewing a good number of file formats in File Explorer. For some reason, this download is no longer available from Microsoft and I felt the lack of it until I found the solution last year. Many file formats are COded and they need to be DECoded to be viewed. Image files are in this category. The Windows File Explorer can preview some image file formats and show small thumbnails but cannot handle most digital camera formats.
My searches for viewing the images in Windows Explorer lead me to a genuinely useful piece of software, the FastPictureViewer CODEC Pack. It supports a very large number of file formats and there is nothing you need to do after downloading and installing it on your computer. From that point on, you will be able to set the file display as icons in three different sizes and your preview panel, when activated, will display a larger version of the file currently selected. In other words, the opening image which could not display anything but application icons will turn into a screen like the one below.
As you can see, the FastPictureViewer CODEC Pack can handle all the image files you can throw at it, there are many formats I have not even heard of that it can handle. Additionally, you can very easily set the icon size to display small, medium, large, and extra-large icons on the file display panel. See the images below to get an idea. The first image is showing the large and the others, extra-large icons. The last image shows the context menu when you Right-Click on a file name where you can pick the icon size.
You can try out the CODEC Pack if you like, but even the paid version is highly affordable at $9.99 for what it does. Although I could not make heads or tails of their FastPictureViewer, the CODEC Pack is worth the money.