When we 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: “This form was customized not working with attachment.”
To resolve this problem, follow these steps:
1. Apply hotfix 953749.
For more information about how to do this, click the following article number to view the article in the Microsoft Knowledge Base:
953749 (http://support.microsoft.com/kb/953749/) Issues that are fixed in Windows SharePoint Services 3.0 by the Windows SharePoint Services 3.0 Infrastructure Update
Click here for more details on msdn.