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 is displayed describing the process as it proceeds. Press ESC at any time to stop.