clipboard problem caused by UAC on Vista

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  I have a problem that only occurs on Vista with UAC enabled. My process is
  running under the Local System account and it is unable to get the full list
  of clipboard formats after it is notified of a change to the clipboard.
  
  For example, if I copy text from the address bar of IE7, my app checks the
  clipboard and would normally see 4 formats:
  CF_UNICODETEXT
  CF_LOCALE
  CF_TEXT
  CF_OEMTEXT
  
  But with the process running as LocalSystem, it only gets the first 2 of
  those. Copying text from a web page has problems, too. Copying text from the
  command prompt works fine, however. Turning off UAC fixes the problem.
  
  I tried impersonating the logged on user before calling
  EnumClipboardFormats() but that didn't help.
  
  Thanks for your help.

  Wednesday, December 23, 2009 6:16 AM