A file extension, or file name extension, is the letters immediately shown after the last period in a file name. For example, the file extension.txt has an extension of .txt. This extension allows the ...

If you’re feeling behind or waiting on documents, a tax extension gives you extra time to file — but not to pay. In this guide, you’ll learn how to file a tax extension, which forms you need, key ...

The IRS' Form 4868, "Application for Extension of Time to File U.S. Individual Income Tax Return," is seen here. The IRS' Form 4868, "Application for Extension of Time to File U.S. Individual Income ...

Ever got stuck with a file that has some mysterious extension? Where no matter how much you try, the Jigsaw puzzle doesn’t seem to fit together? So, for instance, if the file has the extension ...

With nearly 9,000 file extensions listed and 50 users browsing the site on a Saturday night, the Dot What!? claims to be the net’s #1 file extension website. It offers visitors an opportunity to ...

Microsoft hides file extensions in Windows by default even though it's a security risk that is commonly abused by phishing emails and malware distributors to trick people into opening malicious files.