A file extension is a suffix that is added to the end of a file name after a dot. It is usually two to four letters long. File extensions help Windows and other operating systems to know the standard ...

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.

An HTML file that is filled with data from a database by the Internet Database Connector (IDC) component of Microsoft's Internet Information Server (IIS) Web server. The HTML extension file (.HTX file ...