File Type Generic IconSignature File
File Format Standard
Usage Referenced by an application; not meant to be opened manually
Popularity ★ ★ ★ ★ ☆  Common

A signature file contains a small block of text that can be appended to the end of an e-mail message. A basic signature includes the sender's name and e-mail address. More advanced signatures may also include phone numbers, a company name, title, and other information.

Since signature files contain plain text, they can be edited with a text editor. However, most e-mail programs allow signature files to be created and edited within the program. Therefore, there is usually no reason to open SIG files manually.

Open With

IconMicrosoft Outlook

Published June 1, 2009
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Information from the PC File Extensions Reference