u/Anxious-Leadership95

Hi everyone,
I recently took a trip and shot on my Nikon Z5. While checking the photos on the camera, some of them randomly showed a "cannot be displayed" error.
When I transferred the files to my PC, the thumbnails won't show up. When I try to open them, I get a Windows error saying: "It looks like we don’t support this file format."
The files are RAW (NEF) and are still around 30MB each, so it looks like the actual data (or at least most of it) is definitely still there and wasn't completely wiped.
One major detail: The SD card says "SanDisk" on it, but I bought it at a local shop in Vietnam during my trip, so I have a strong feeling it might be a counterfeit/fake card that corrupted the files.
Has anyone dealt with this specific corruption before? Is there any reliable way, tool, or software to repair the headers or recover these NEF files? I'd really hate to lose these travel memories.
Thanks in advance!

Tomorrow is my last day in Hanoi, and I’m looking for a one-stop shopping spot where I can finish all the souvenir shopping I still need to do — handicrafts, textiles, chocolate, and more. I’m not looking for shops in the Old Quarter, but rather a single complex or market that’s less touristy and has more reasonable prices. I know many destinations have places like this, where you can get everything in one place for better value, and I’d love to make the whole process easier and less tiring. Does anyone know a place like that?