I'm trying to use vb.net to list the properties of DWF files (width of pages etc.). In new to vb, and am struggling to understand the express viewer API. Can anyone help me with info on what things like CadCollection's & IadCollections are? I've found things like the width() property in the iadpagepaper object, but can't make it get this info for a particular file. I've been trying to make an IadCollection and add my DWF files to it, and then extract the info, but am falling at almost every hurdle!!!! Thanks.