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

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Solved) msbuild is not recognized as an internal or external command, operable program or batch file while working with PCF