File doesn't exist

The "File doesn't exist" failure error often refers to something in the Workdir.

Your application will require suitable read/write permissions for the Workdir and/or its parent directory if it doesn't exist. The Workdir is usually specified as a parameter to NalpLibOpen(); if omitted, the default is CSIDL_COMMON_APPDATA/Nalpeiron. See https://docs.microsoft.com/en-us/windows/desktop/shell/csidl for further details.

Solution

Check directory access permissions and parent directory access permissions for the user in question; read/write is required.

Error Codes