FileExplorerGallery is a utility tool that enables you to access all the images available in your currently opened folder as soon as you press the assigned hotkey. Developed by Martin Chrzan, this photo viewer app displays a certain gallery that's integrated into Windows File Explorer.

It is a completely free software solution that you can download as well as utilize on any of your compatible Windows desktops. This can be a good alternative to FastStone Image Viewer and IrfanView although, this open-source project doesn't allow further editing of photos.

Access photos in one hotkey press

To quickly view photos in a folder, you only need to press the default F12 hotkey button. You can possibly change the designated hotkey to any button of your preference. Once clicked, all the detected images will be displayed in a full-screen window and you will be able to choose the specific image you want to focus on.  

Apart from viewing capabilities, it supports other operations as well. When you move your mouse scroll or double-click photos, it will allow you to zoom in on them. On the top border, there'll be a rotate icon displayed which you can click to turn your image around a certain degree. You can also run a slideshow with your photos, by simply clicking the dedicated icon seen on the top border. 

If you wish to configure its duration, just go to the program's settings. You will be able to open it on the app's icon sitting quietly in your system tray. Just right-click on it and all the options will then be presented to you. Updates are automatically provided and you can set to start it along with your Windows startup.

Simple image viewer alternative

FileExplorerGallery's simplicity is one of its major charms. It probably doesn't have more advanced or editing features as compared to other photo viewers but, it's still handy for perfectly doing its job as it is. By pressing a button or clicking your mouse, you can instantly view images and do further operations with them.