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Internet Explorer 6 in Windows XP SP2 includes extra security, which blocks javascript and vbscript in web-pages placed on the local drive. This security is also activated when opening a XML file placed on the local drive:

To help protect your security, Internet Explorer has restricted this file from showing active content that could access your computer. Click here for options...

One cannot browse the XML document without right-clicking the warning and selecting "Allow Blocked Content". This can be quite annoying when daily working with XML files.

There are two known solutions to this problem:

• Use a different browser/viewer to browse XML documents
• Disable the extra security and allow scripting for all web-pages placed on the local drive
  1. In Internet Explorer go to the Tools-menu and select Internet Options...
  2. Go to the Advanced-tab and scroll down to Security and enable Allow active content to run in files on My Computer
  This change is reflected in this DWORD registry key:

  [HKEY_CURRENT_USER \Software \Microsoft \Internet Explorer \Main \FeatureControl]
  FEATURE_LOCALMACHINE_LOCKDOWN = 0

More info MS KB Q878461
More info MS KB Q883969
More info MS KB Q910878

Credits phdcc.com