Error message when you try to open an ActiveX control-bsed MIME handler in IE7: "Invalid character"

When you try to open a Microsoft ActiveX control-based MIME handler in Windows Internet Explorer 7, you may receive the following script error message:

Line: Line number
Char: Character number
Error: Invalid character
Code: Code number

Line: Line number
Char: Character number
Error: Object expected
Code: Code number

For example, you may receive this script error message when you try to open a Macromedia Shockwave Flash (.swf) file or when you try to open an Audio Video Interleaved (.avi) file.

This problem occurs if the following conditions are true:

• The file is located in the Internet Web zone or in the Intranet Web zone.
• The Allow active content to run in files on My Computer check box is selected in Internet Explorer 7.

Note To locate this check box in Internet Explorer 7, click Internet Options on the Tools menu, and then click the Advanced tab. Under Security, you can see the Allow active content to run in files on My Computer check box.

Source:  http://support.microsoft.com/default.aspx/kb/934366