Generates preview images for blocks displayed in DesignCenter.

Use this command to generate icons for blocks created with an earlier release. You can enter a series of comma-delimited block names or wild-card characters. For example, enter b1,?2, to specify that block B1 and all two-character blocks ending with 2 should be updated.

After you enter the block names, a message displays the process status. Press ESC at any time to stop.