WRT1900AC shows iMac device as Win7 OS

Hi,

When you go to the Network Map and get device info on my iMac, it is listed as running Windows 7 and a Vize media server as per the attached screenshot.

I am running

• iMac (27-inch, Late 2012) - OS X Yosemite 10.10.2
• VMware Fusion v7.1.0 with a Win7 image
• WRT1900AC - v1.0 HW,  Firmware 1.1.8.164461

The Windows 7 virtual PC lists as a seperate network device and is correctly listed as running OS: Windows 7.

Any ideas?