IrfanView has been around for over 20 years. If you use it, you’ll notice its menus and overall look still have that Windows 98 look! IrfanView is a small program that will help you view and edit your image files.
But why would you use it (over more modern apps)? This program does exceedingly well at opening old, archaic file types. If you have found some old pictures that you can’t open, IrfanView can probably help. Some examples:
If you find an old digital camera in your junk drawer, and it’s full of photos in the FlashPix format, IrfanView can open those files.
If your designer gave you some archival files in the Photoshop format, IrfanView can handle them.
And once you open such files in IrfanView, you’ll also be able to use the Save As… function to convert your your files to JPG or other modern formats.
IrfanView is free to download for personal, educational and charitable use. If you want to use it in a professional setting, they ask $12 per license.