The :prompt_waxtrace_asset picker block maps Y: to the enrollment share
so select-waxtrace-asset.ps1 can read INDEX.csv. The later :skip_machinenum
block also runs `net use Y: \\172.16.9.1\enrollment ...` to keep the share
mounted through the rest of imaging, but Y: is already mapped at that
point so the second net use throws "System error 85: The local device
name is already in use". Harmless (script proceeds and "the command
completed successfully" prints right after) but visible noise to the
operator during PXE imaging.
Gate the second net use behind `if exist Y:\` so we only map when Y: is
not already mounted. Same end state, no error message.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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