Files with the file extension .SIG are those which are associated with email signature files. They are placed at the end of every email message and contain your contact and business information. SIG files are typically used with POPMail, which is currently on the POP3 version and is widely used on most of the current email servers such as Gmail and servers associated with Outlook Express.
In terms of content, SIG files are simple text files which contain contact information as described above and any other type of information you wish to include in your signature when you sign your name to your email messages. SIG files can be prepared in advance and then automatically attached at the end of each email message to avoid having to enter the same information over and over whenever you compose an email message.
Most POP (Post Office Protocol) email programs will also support more than one SIG file which can easily be chosen each time you sign your name to an email message.
How to Open SIG Files
There are a variety of ways that you can open, view, and modify SIG files. The most common way to open such files is directly in the email program you are using. Most email clients provide you with a way to create a SIG file right in the email interface; therefore, you can also open and view SIG files in your email account to perform modifications.
If you have received a file with the file extension SIG in the form of an email attachment, this is also known as a signature block file. SIG files are typically ASCII files in which case they can be read by any text editor. Simply right click on the file and then choose Open With from the drop-down menu. Choose the text editor you want to use such as Notepad from this list or click on Browse to locate it. If the SIG file contains text only, you will be able to view it in your text editor.
There are also email clients which support graphics and other elements that contain Hypertext Markup Language (HTML). In this instance, a SIG file may contain an .HTML extension, which can be viewed by double clicking on the file and allowing the default program to automatically open it. In the case of HTML, the default program is typically your web browser.
SIG files are also known to exist in programs such as Print Shop that are created by Broderbund, which makes graphics software products. If the SIG file contains graphics, you may also be able to open it in a Broderbund program if you happen to have one installed on your PC.