Apple released a new format that they are pushing through their devices that is replacing .jpg with .heic which is a smaller file size that enables you to take more pictures before you fill up your storage space.
Windows and Android users are stuck in the middle as Apple users will share files and albums and the Windows users can not open them or even send them to a vendor like Walgreens to get them printed.
I have found a free converter that will let you convert the .HEIC format ..
It is called Imazing HEIC Converter and it is free. I could not find any malicious software that came with the install. It will provide a screen to drag and drop files onto, which will then prompt you to choose a location that it will create the jpg files.
I Hope this helps. Craig