Hi niemisto88
The simplist way is to use the executefile function you will find this in 'demos/doc/filemanex' folder
call it like this:--
ExecuteFile('C:\windows\Notepad.exe', ' Any parameters your program may require', 'Folder to use', SW_SHOW);
Where
parameters can be empty string '' for notepad you can pass the name of the file you want to open.
default dir can be empty string''
The final parameter defines the window the program will run in. See the help for possible values.
Hope this helps
Steve