Microsoft Paint can modify, open, and save several file formats, which include single-page TIFF, PNG, JPEG, GIF, and BMP (Bitmap). However, the default file format for Paint is BMP.

Update, Repair, or Reset the Photos App On both Windows 10 and 11 PCs, Microsoft Photos is the default app for opening JPG files. So, if there's a problem with this app, it may fail to open any ...

If you can't change default app by file type in Windows 11/10, then reset the problematic app, remove file type association, etc.