Nas Drive access not visible

Hi, I have installed on 2 PCs, one worked fine and I can see the NAS drive I use to store files, the other does not see the NAS when I try to open a file in GanttProject. I can access NAS folders through everything elose on machine, but not GanttProject?

As soon as it appears in your operating system file system (mounted to some drive with a letter in Windows) it should be visible to Java, and to GanttProject.

The mapped network drive has been on operating system for a long time. I have installed Ganttproject recently. I can access mapped drive from all other apps on machine. I can access mapped drive from Ganttproject on other PC I have put it on?