files turning into an exec

I am trying to upload photos and videos off of an sd card from a go pro. I uploaded them onto a dell laptop the first time and it worked perfect all the content was there and able to open and view. Then I decided to move them over to my mac for better editing options. I put them back onto the original sd card and put that into my mac. Now when I try to view and save those photos and videos about half of them show up with a grey cover that says "exec" in green and it wont let me open and view them. Ive tried a couple things to fix and all have failed. The extension on the file are ".LRV" and some are ".HTM". Please help really need these pictures.