.DO File Extension
What is a DO file?
A DO file is a web-based Java program run by a web server that supports Java, such as Tomcat or IBM WebSphere. It is typically mapped to the Struts controller, which processes the file. DO files are used for generating dynamic webpages.
Some webinar programs may generate DO files that are formatted as .VCS files. Changing the file extension to ".vcs" may allow these files to be imported into various scheduling programs.
NOTE: The ".do" extension may also be a URL mapping scheme for a web application and not a file extension. For example, the Struts framework often uses the ".do" string for mapping Java servlet actions in the web.xml configuration file.