Your client does not support opening this list with Windows Explorer.

Environment:

Microsoft Windows SharePoint Services 3.0

Scenario:

• When you try to open a document library in Explorer View, the folder does not open and gives you following error

Your client does not support opening this list with Windows Explorer.

• Specifically, this problem occurs when you connect to a document library in a Windows SharePoint Services 3.0 Web site by using Microsoft Internet Explorer.
• You browse a folder in the document library, and then you click Open with Windows Explorer on the Actions menu and then nothing happens or just received above message.

Cause:

• You are using Microsoft Internet Explorer 6.

Or

• The path of the folder contains more than 100 characters.

Workaround:

To get rid of this try following

• Apply hot fix 325355 for Internet Explorer 6.

Or

• Use Windows Internet Explorer 7. For more information about Windows Internet Explorer 7, visit the following Microsoft Web site:
• http://www.microsoft.com/windows/ie/default.mspx

Additionally there might be other causes and resolutions as well J