Попробуйте заменить src/libnetxms/tools.cpp на приложенный и пересобрать.
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C:\Source\NetXMS\x64\debug>nxget -e0 127.0.0.1 system.AntiVirusProduct.Active
1
C:\Source\NetXMS\x64\debug>nxget -e0 127.0.0.1 system.AntiVirusProduct.DisplayName
Microsoft Security Essentials
C:\Source\NetXMS\x64\debug>nxget -e0 127.0.0.1 system.AntiVirusProduct.UpToDate
1
C:\Source\NetXMS\x64\debug>