ASP. html: has configuration informaiton that is invalid.
ASP.NET.htm: has configuration informaiton that is invalid.
Date.htm: has configuration informaiton that is invalid.
JSP.htm: has configuration informaiton that is invalid.
PHP_MySQL.htm: has configuration informaiton that is invalid.
Spry.htm: has configuration informaiton that is invalid.
XSLT.htm: has configuration informaiton that is invalid.

In Windows XP, simply deleted the cache file for DreamWeaver:
WinFileCache-AD76BB20.dat in C:\Documents and Settings\user\Application Data\Adobe\Dreamweaver 9\Configuration.

In VISTA, delete the .dat in C:\Users\ —- your user —– \AppData\Roaming\Adobe\Dreamweaver 9\Configuration

In MAC, User~/Library/Application Support/Adobe/Dreamweaver CS4/en_US/Configuration/MacFileCache-F9FAD2A1.dat