>>
>>
>>BUT, if I do the same call with an EXE (same PRG compiled) from the Windows command shell, it throws an error:
>>
>>C:\tst.exe "MERGE" "C:\Temp\\80115cd9-7b28-40db-b324-f108b0fcaaad.pjx" "c:\DESA\foxbin2prg\foxbin2prg.pjx" "c:\DESA\foxbin2prg\foxbin2prg.pjx#/main/Soporte_MNXcs107" "c:\DESA\foxbin2prg\foxbin2prgpjx/main#cs110" "C:\Temp\b3894431-a073-4ada-8eb9-2f0e80a760b4.pjx" "c:\DESA\foxbin2prg\foxbin2prgpjxmainv115p1cs" "C:\Temp\\9b139b4b-f99b-443a-9f09-46881abb6be5.pjx"
>>
>>
>the commas seem to be missing!

Nope, this is for the DOS command line, where the space delimits the parameters.