usually mapsource uses the system language, if yourlang.dll is not present it uses by default english, probably Cyclo map installer contained an old MS version installer too, next time uncompress the map installer and check and run just the map installer.
You can uninstall that old MS version in your control panel / uninstall programs option.
You can also rename italian language dll to english and have the italian MS interface in another language system os.
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