acf5e740_ded_Data__DXF___DXF_Reference___Entity_name
[Group code] 1001 also a string value [Description] Application names can be up to 31 bytes long (the 32nd byte is reserved for the null character). NOTE Do not add a 1001 group into your extended data because AutoCAD assumes it is the beginning of a new application extended data group. [Entity name] 
Application name
Extended Data [DXF - DXF Reference]
Entity name