HEIF Image Extension didn't work for you?I don't know why,because i have never used it.Have you consulted anyone else who has used it or Google?
Okay,i got it,you can try this software to open heic file on Windows computer,including images and other files.You can even convert heic images to jpg images online,just open go to heictojpg.com,but it needs to be long enough to get the job done.Installed the extension from Microsoft store and there is no option for viewing after right clicking the heic image