Hello, I did not use GZIP but this may serve as a guide you:
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[TD]DEFINE VARIABLE c-file1 AS CHAR.
DEFINE VARIABLE c-file2 AS CHAR.
c-file1 = "C:\TEMP\citivta.zip".
c-file2 = "C:\TEMP\citivta.txt".
OS-COMMAND SILENT VALUE("z-rar.bat " + c-file1 + ' ' + c-file2).
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Generate a batch file (z-rar.bat) as follows.
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[TD]@echo off
set OLDPATH=%PATH%
set PATH=C:\Archivos de programa\WinRAR\;%PATH%
rar a -ep %1 %2
set PATH=%OLDPATH%
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Regards.