If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

If you don't know the name of the file or files you're looking for, but instead want to bring up all of your Word and Excel files, use the "OR" search operator.

An in-depth guide to setting up SyncThing for free, cross-platform file sync.

If Excel is not opening on double-click or not responding on your Windows 11/10 PC, take a look at the addons first, or else follow these suggestions to resolve the issue.