You could try this . Right Clicking on the XML file choose Properties . When the Properties window opens up click on the CHANGE button . Then Browse to where your OFFICE XML handler is located.
My Computer
At a glance
Windows 7 Ultimate 32-Bit & Windows 7 Ultimat...Intel Core i7 CPU 950 @ 3.07GHzOCZ 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 160...ATI Radeon HD 5700 Series
Computer Manufacturer/Model Number
Custom Built
OS
Windows 7 Ultimate 32-Bit & Windows 7 Ultimate 64-Bit
You might want to check the properties inside dreamweaver
My Computer
At a glance
Windows 7 Ultimate 32-Bit & Windows 7 Ultimat...Intel Core i7 CPU 950 @ 3.07GHzOCZ 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 160...ATI Radeon HD 5700 Series
Computer Manufacturer/Model Number
Custom Built
OS
Windows 7 Ultimate 32-Bit & Windows 7 Ultimate 64-Bit