显示autocad缩略图，个人觉得不错，所以拿出大家-Show thumbnails autocad, personal feel that good, so we come up with

CAD Import VCL 6.1 New features: - AutoCADÖ DWG 2007 file format is supported. - AutoCADÖ PROXY (including AEC) entities are supported. - HPGL/HPGL2 file format - Bezier splines are supported. - DXF loading has been optimiz