Resolution:
By default, Windows Engines run as the Local System account. This means their access to other file servers are based on the Local System account, not your account. This can cause some file servers to deny access to an Engine.

To solve this issue, you must ensure that any file being shared to Engines from a file server is accessible from the Local System account by changing permissions on the server or file.

Note that when using DSHook, Engines are not run from the Local System account, but rather use the account you specified during installation.