There is another category of hidden file on Windows: Even with the Hidden items box checked, Windows still keeps key operating system files out of sight so they can't be tampered with.

To control what shows up in these results, open iOS Settings and choose Search. If that doesn’t turn up the file you’re after, head to the Files app that comes preinstalled on iOS.

If you open an attachment from within your email program and then save it, the file may seem to have disappeared. Similarly, files you download from the web can be hard to find if you don't know ...

If you receive File in Use. The action can't be completed because the file is open in another program even if file is closed in another program, see this.

How to Find an Outlook Contacts File. Since the release of Microsoft Office 2007, all Outlook contacts are stored in a PST file. Copying your Outlook account's PST file to another computer or ...