System Exec - not possible to recognize program or batch file

I'm trying to execute LPR.exe command to print some labels on a printer. However as its normal, problems occur. I could not find answer on any topic conneced with "sytem exec". I already tried all described methods (I think so). That's why I'm asking very kindly for any help. When trying to execu

How to Run Batch Files silently in background on Windows 11/10

How to run .BAT files invisibly, without displaying the Command Prompt window » Winhelponline

Python is not recognized as an internal or external command

System Exec - not possible to recognize program or batch file - LabVIEW General - LAVA

Command Not Recognized When Using System Exec VI - NI

How to create batch script files on Windows 11

sqlcmd.exe' is not Recognized as an Internal or External Command, Operable Program or Batch File [Ispirer Migration Knowledge Base]

System Exec.vi Does Not Wait for BAT File to Finish in Windows 7 64bit - NI Community

how to fix not recognized as internal or external command operable program or batch file