Have you tried it out on other versions of WindowsServer?
What access rights does the app have while running?
Is it being run as a service? If so, as what user?
What version of Powerbuilder? Do all of the DLLS on the server match your local machine? Are there multiple versions of the DLLS on the server and search path possibly causing issues?

All,

Brads Questions:

Application has been running on Windows 2008 R2 for several years without issue, we are upgrading all of our servers to Windows 2016 (VM).

Set to run as Admin

Application is executed from the Windows Task Manager on a regular interval. Closes after running

Server is a new build and we only installed one version(2017 R3 1858)

Chris:

Move or Copy Fail using mapped drive or full path. We have a dedicated File system that is not part of a single server.

New Information:

We found that if we create a new PB 2017 application it works correctly but when we migrate our application from PB 12.5.1 it does not. We also tried exporting the Source Code in PB 12.5.1 and then creating a new application in PB 2017 and then importing the PB 12.5 objects it also fails. BTH this is a very small application 1-Window, 1-DataWindow, 1-UserObject, and a few Functions. PBL's are zipped and attached.PBL's have been migrated to Appeon 2017 R3. I can send original PB 12.5 if needed.

One more thing:

I tried using both methods to do Move and Copy files native to Appeon FileMove() and also using Kernel32 call in Local External Function (MoveFileA()) both return -1 unable to open source.