File Names and Extensions

Use the following style guidelines for file names and file extensions.

• For file, directory, and drive names, use the exact spelling and capitalization used in the program or file itself.
• Use all lowercase for file extensions. For example, Word adds .docx to a file name if you neglect to specify the file format when saving. Refer to the Microsoft Manual of Style for Technical Publications.
• If you can't avoid using the file extension to describe the file, precede the extension with a period; for example, “a .zip file.”
  • If the extension displays within a sentence, use lowercase; for example, “A .txt file that is renamed to .rtf is not searched.”
  • If the extension displays within a heading, use title case; for example, “Renaming .Txt Files.”
  For more information, see Microsoft Manual of Style for Technical Publications.
• File name is always two words.