This command is not available in the RISC OS script interpreter.
Description
This will look at the last file that the script wrote to and attempt to find a handler for it according to its type, namely:
.txt
Text file
Loads into Notepad
.htm or .html
Hypertext file
Loads into Internet Explorer
.dpd
OvationPro file
Loads into OvationPro
When a handler is found, the file will be loaded into that program.
This command asks the system, so it will detect if OvationPro is not present, and also if you have set up to use Firefox (etc) instead of MSIE.
Notes
The file verification stage, which takes place as the file is opened/created will block attempts to overwrite system files, to create .EXE or .DLL (etc) files.
While I cannot guarantee this system is completely secure, I have taken a number of steps to prevent scripts from performing destructive actions.