Windows File Extension Reference
Plain-language Windows file extension reference for common document, installer, script, archive, image, media, and system file types.
File Explorer
Explorer freezing, missing folders, and search that does not find files.
Start with the closest symptom
These guides are grouped here because the first checks overlap. Open the guide that best matches what you see now, then use its verification section before moving to a broader fix.
How to Fix File Explorer When It Keeps Freezing
When File Explorer hangs, turns white, or restarts itself, isolate preview handlers, network folders, and a busy disk before you reset Windows.
Related tools
- File Extension Lookup, Look up common Windows file extensions and see what they usually are, what opens them, and when to be careful.