Folders converted into exec files

Good evening, I have a memory stick with format MS-DOS (FAT32) where I usually put documents created in my computer (mac, OS X El Capitan) to print afterwards at my job. I printed a couple of documents today from a Windows computer and when I came back home and connected the memory stick in my mac half of the folders were converted into EXEC files.

I've read all the related threads and I can't find any solution to recover the folders. There's no virus in the memory stick, there's no hidden folders/files and I don't have a backup of some documents I created this week (the ones I need) since I make a copy once a week.

Thank you very much and I hope somebody can help. I include a screenshot of the info of one of the folders as example.