DIA file extension - Psion Organiser diary file
What is dia file? How to open dia files?
File type specification:
The DIA file extension is associated with the Psion Organiser CM/XP Format for OPL (Organiser Programming Language). OPL is a quite powerful compiler language. This means that the source code (what you type in) is first translated into a kind of machine code and can then be used like a built-in application.
The .dia file stores data for Psion Organiser diary.