Werk #4660: win_os: Fixed wrong OS information if eg. ESX is installed on Windows host

Component	HW/SW inventory
Title	win_os: Fixed wrong OS information if eg. ESX is installed on Windows host
Date	May 15, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p23 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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