When I click a picture from my cannon T7i it gives me a preview for few seconds and few moments later there is just a question mark "?" and it says "Cannot Play back image". I tried transferring the pictures to my laptop I noticed that there were in cr2 and jpg format and no thumbnail. When I tried opening it in my laptop it says, "It appears that we don't support this file format." Raw Image Extension is already installed in my laptop. Nothing is working.
Please help. This camera contains wedding photos of my friend and are very important.
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I wonder if some of those images were shot on a different camera. As you may know, RAW files are specific to the camera, so your photo viewer or editor needs to have not just RAW support in general, but RAW support specifically for the camera in question.
The screenshot you shared seems to be from a Windows folder, rather than from Digital Photo Professional. Can you confirm that you're seeing similar results when you view in the latest version of DPP4?
You can get it from the download page for the EOS Rebel T7i:
In case the link doesn't work, try to copy and paste it into your web browser.
IMHO, those photos are lost. You should have not formatted the SD card as most SD makers have recovery software that can retrieve corrupted files. If DPP4 is not showing anything from the file (photos) I am afraid that is a real bad thing. You might contact the SD maker and see if, at this point any recovery software might be of help.
Tell them exactly what you did and have done. They still may be able to help but for certain do not use that SD card again. Also do not do anything else to it unless its maker instructs you to. For instance Sandisk has SanDisk RescuePRO. Other makers have their own, too. I don't know if it works on a Windows folder but it might.