Meaning: The file is in your list of recently used files, but is no longer available. A network resource could be unavailable, or the file could have been renamed, moved, or deleted. Click Yes to remove the file from your recently used files list. Click No to keep the file in the list. Clear Show this message in the future if you want Smart 3Dx to not display this message in the future.
Recovery: Check your network connections. Verify that the file still exists in its original location. If the file exists in a substituted folder, verify that those substitutions are current.