oreoshake, thanks. That's good to know. I'll have to read up on that feature. Below is a (very) brief snip of what it output. Everything showed "windows" in the first column, so I assume there are no problems there.
C:>splunk cmd btool --debug wmi list
windows [WMI:FreeDiskSpace]
windows disabled = 0
windows interval = 300
windows server = localhost
windows wql = SELECT FreeMegabytes, Name, PercentDiskTime, PercentFreeSpace, DiskBytesPersec, CurrentDiskQueueLength FROM Win32_PerfFormattedData_PerfDisk_LogicalDisk
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