<< As I indicated above, this happens in only 1 computer (Windows XP) that is configured the same way as the other computers that work. >>
On this one computer, try logging in as a different user, reinstalling Acrobat, and running the program as the new user. If the problem is specific to the original user, try reinstalling Acrobat on that account. If that doesn't work, you may have to recreate the user account on the computer. It is possible for the file associations to break specific to one user so that Windows can still open the file while ShellExec (the Windows call R:Base is using to launch the file) cannot. -- Larry
