DESUMA supports the UMDES file format (.fsm) as well as an .xml format which additional information like position and event properties across multiple agents. You simply open an existing file in .fsm format and it will automatically be displayed in a DESUMA workspace.
Note: the UMDES file format is sometimes abbreviated as .fsa so Desuma will open up them as an alternative. If the file has no extension, Desuma will try to open it up nonetheless.