Showing File Extensions in Windows Explorer

The default for Windows Explorer is to “not show” the file extensions in the "file list" view. This could allow you to think a .txt file is safe to open and not a virus because it is only a harmless text file. This is deceiving because many email viruses have double extensions (.txt.exe, or .txt.vbs). The .exe or .vbs extension will be concealed and all you see is the .txt. I recommend you NOT to hide file extensions as follows:

Open My Computer

Select Tools | Folder Options and click on View tab

Uncheck the box for “Hide file extensions for known file types”