1. Step 1: After opening the software, select the file to be processed, as shown in the figure below, and then proceed to the next step.

2. Secondly, after completing the above steps, open the dwg file with watermark and save it in dxf format without any modification, as shown in the figure below, and then proceed to the next step.

3. After completing the above steps, save it as a new document format in this way, open the "dxf" file with software, then save it as the specified version, as shown in the figure below, and then enter the next step.

4. Then, after completing the above steps, you can select "R2007-R2009(*). Dwg) "option, as shown in the figure below, and then enter the next step.

5. Then, after completing the above steps, edit the newly saved file through AutoCAD to view it, as shown in the figure below, and then go to the next step.

6. Finally, after completing the above steps, the desired results are obtained, as shown in the following figure. In this way, the problem is solved.