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Open the file,
Save as
then at the lower option select the lower version you want to save.
by save as file and change file type from new format to old format
Opens the DWG Convert dialog box. All files to be converted are indicated by a check mark next to the file name. Right-click in the file display area to display a shortcut menu with several options.
By clicking save as > files of type > Auto-cad 2007 (for example)
