.STML File Extension
File TypeSSI HTML File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is an STML file?
HTML file that contains server side includes (SSI); references directives on the server, which dynamically generate content for the Web page; processed by the server when they are accessed by a user.
Server Side Include Web pages more commonly use the .STM extension.