Notes about the UML file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The UML file type is primarily associated with 'Visual UML' by Visual Object Modelers, Inc.. Object modeling tool that provides support for all of the OMG UML (Unified Modeling Language) 1.3 & 1.4 diagram types: Use Case, Package, Class, Object, Activity, State, Collaboration, Sequence, Component, Deployment and Robustness diagrams.