get_open_filename_inputprompts the user for a file name to open
Note: This API function differently on the command-line vs the UI. In the UI a pop-up is used. On the command-line a simple text prompt is used. The UI uses the native window pop-up for file selection.
Multiple file selection groups can be included if separated by two semicolons. Multiple file wildcards may be specified by using a space within the parenthesis.
Also, a simple selector of “*.extension” by itself may also be used instead of specifying the description.