
You need a suitable software like Preview to open a HEIC file.

Image processing software that can open images saved in this format include but aren't limited to GIMP, Photoshop, Lightroom, and Preview. Other operating systems including Windows and Linux also support HEIC files. As such, HEIC files are mainly used by Apple products such as iOS 11. The HEIF file format was developed by the Moving Picture Experts Group (MPEG) and images HEIF images saved in HEIC files are typically coded using High Efficiency Video Coding. Each HEIC file serves a container for image metadata, thumbnails, image derivations, auxiliary image items, and an image, or a sequence of images displayed frame by frame (like an animated GIF).

HEIC files contain one or multiple images saved in HEIF (High Efficiency Image File) format. HEIC files mostly belong to Preview by Apple.
