Error message when you try to attach a file in a custom form on the Web site in Windows SharePoint Services 3.0: “This form was customized not working with attachment"
You use Microsoft Office SharePoint Designer 2007 to add a Custom List Form Web Part on a Microsoft Windows SharePoint Services 3.0 site. Then, you try to attach a file by clicking Attach File in the custom form on the Web site. When you do this, you receive the following error message:
Microsoft Windows SharePoint Services 3.0
Microsoft Office SharePoint Server 2007