Some users have reported that when they attempt to open a Word document, it fails to open. Instead, they see a Word cannot open the existing file (Normal.dotm) error ...

To fix the Error 0xc10100bf, This file isn’t playable, check the file format you're trying to play is supported. Other than that, follow these suggestions.

If you run into a "Content File Locked" error while using Steam, don't despair, it should be fixable. Here are some potential solutions to try out.