After opening attached tcw file, scroll up and scroll down doesn't work.
The reason for this behavior is the wrong camera parameters (position and target point) . The camera is too far (unreal) from the subject. To fix the problem, we need to move the camera closer to the object.
1) After opening file change the view from View menu, select any view from 3D views and then try to scroll up and down.
2) Copy the drawing and paste it on to a new file and then scroll up and down.