The HEIC image format is not natively supported in Windows 10, there is a HEIC Extension avaialble on the Microsoft Store for around $1 that will add support for HEIC images to Windows 10.
If you intend sharing your images with other people, then it would be best to convert them to jpg images.
Also on an iPhone there is a setting avaialble to switch the image format from HEIC to JPG by default when you take photos with that phone.