Increments the progress bar and allows status message to be updated.
WM_ProgressWindowReport <identifier> <progress message>
| 
                             identifier  | 
                        
                             The identifier of the progress window to update.  | 
                    
| 
                             progress message  | 
                        
                             The new progress message to show in the window.  | 
                    
| ▲ Command Summary ▲ | ||
| ◄ WM_ProgressWindowCreate | WM_RevertToSaved ▶ | |