It also shows the message that docx is the xml-based format that is used and it 'cannot store VBA macro code.' It hasīeen going on all week. Will not do the 'Save As' and it states at the bottom the 'recommend compatibility issues' check. The SAME drive will open Word Documents on the MAC and save the changes but it I have tried opening my Word documents on the PC from an external drive formatted with the ex-fat file formatting and those documents can 'Save As' on the PC.