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To collect WMI data NMIS has to use a WMI access tool. At As of NMIS 8.6.0 we are using wmic, a commandline tool belonging to the Samba software suite.
NMIS 8.6.0 ships with a precompiled wmic program, and installs it as /usr/local/nmis8/bin/wmic. If the precompiled version should not work on your platform, the installer will notify you of that problem and you'll have to perform a manual build of wmic. The sources for wmic can be downloaded here: http://dl-nmis.opmantek.com/wmic-omk.tgz and you shouldn't have to do more than unpack that, and run make. When the build is complete, you should copy the resulting  wmic file to /usr/local/nmis8/bin/.

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If the node in question requires a windows domain prefix for the WMI access, then prepend that to the wmiusername followed by a "/", e.g. "somedomain/theuser".
In NMIS 8.6.7 and newer you can also provide the domain in the form "theuser@somedomain".

Automatic model selection does include WMI as a source of information, if SNMP is not available and if wmiusername and wmipassword are set.

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'system' => {
  ...lots of stuff...
  'sys' => {
    'standard' => {
      'snmp' => {
      ....lots of stuff...
      },
      'wmi' => {
        'bios' => {
          title  => "Bios Name",
          query => 'select name from win32_bios',
          field => "Name",
          calculate => '$r =~ s/\s*$//; return $r;',
        },
        # if we want to type less, we can set a shared query - not required, though!
        "-common-" => {
          query => 'select * from win32_pagefileusage'
        },
        'totalswap' => {
          title => "total swap in bytes",
          query => 'select allocatedbasesize from Win32_pagefileusage',
          field => 'AllocatedBaseSize',
          calculate => 'return $r*(1<<20);',
        },

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• It is not possible for a systemHealth section to have both snmp and  wmi sections.
  This is because only one index per systemHealth section is supported, but wmi and snmp can not share that single index.
• At this time, collection of the following types of statistics from WMI is not supported:
  Network Interfaces
  Environment Data
  CBQoS Data
  Calls
  Server-type processor and load information
• NMIS does not yet support service tests for WMI-sourced process information.
• Collection of indexed WMI sections is not optimised for maximum efficiency yet.
  query results are reused to some extent but not universally, and further optimisations are planned.
• The GUI model editor does not support editing of WMI sections yet.