Question:
Is there any way to create a directory from within a PowerBuilder application without using the RUN command? Or is there a way to get the RUN command to complete execution and drop the DOS window completely so that other dependant code can execute properly? I am using:

Run("command.com /C mkdir C:BILLPRT",Minimized!)

However, unless processing stops (messagebox or user input), the DOS window remains and the directory cannot be used, since it appears that the RUN command has it locked.

Answer:
You can use the PFC File Service:

pfc_n_cst_filesrv.of_createdirectory()

If you are not a user of the PFC, then by examining the PFC code you can see the API call being used.