If you’re still using Windows XP, you may have noticed that folders of digital images usually contain a file called Thumbs.db. You’ve probably wondered what it is and whether you can safely delete it.

Q: I often see a file called Thumbs.db in many of my folders. I delete it, but it keeps coming back. What is it and how do I get rid of it for good? A. Thumbs.db is a cache file created by Windows ...