>Are files on a network? Is user logged in?

The files are there - I can testify to that. When I run it manually, they're found, opened, converted - all under the same login as the one used for the scheduled task.

And the task is set to run regardless of whether the user is logged in or not, and it errors the same both ways.

BTW, this works without a problem in a couple of other places (with paranoid security settings) but with an older version of Windows.