Access Icedrive from scheduled task

I would like to access Icedrive I:\Dir\Files from a scheduled task. So far I haven’t figured it out, whether I use my account or SYSTEM or whether I’m logged in or not. (If logged in, I can access it just fine from the command line or Explorer, but not the scheduled task.)

I’d like to be able to run nightly whether I’m logged in or not.

Any tricks for this? Maybe a command-line option to icedrive.exe?