If you need to restore hidden files using Time Machine you may run into some problems revealing them. Here are some methods for addressing this in OS X.

If a virus has changed all the files extensions to unknown applications, then restore default file extensions, format & icons to original state thus.

You can restore the default folder location for Libraries in Windows. In this post we show you how to reset the Library folder location.

Do you want to open a file type or link with a specific app? Here's how to change the default app settings on Windows 11.