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 ▶ | |