Last week we deployed the Acrobat Reader 8.0 to our network machines. In my app I use a _shellexecute routine to open files in their native environment. On machines that still have the Windows 2000 OS the retval of the shellexecute is 2(Bad Association) this does not happen on Windows XP nor did it happen on the previous versions of Acrobat on any of the Windows 2000 machines. Please help.