The CAD drawing TM is the abbreviation of trade mark, which means registered trademark. As shown in the picture:

Generally speaking, if the CAD drawing cannot be opened, it can be attributed to the following reasons:

1. When the CAD software opens the drawing, The path to the last file opened will not be found if the path has changed!

2. If you use a lower version of CAD software to open a higher version of the file, it may not be possible to open it. At this time, you can only install the higher version of the CAD software.

3. The file itself has been damaged. This situation is relatively common. If this happens, you can use the repair function of the software to repair it. There is no better solution.

4. Some software developed by a third party is used, but such software is not installed on the current computer. For example, certain versions of Li Zheng or Tian Zheng are used. The solution is to install it on your own computer. Install these software.

5. There is a problem with the CAD software in the computer. At this time, the software needs to be reinstalled. When deleting the software, remember to clean the registry to ensure a clean uninstallation.