Install-FormtracepakSettings decided per-user vs HKLM by matching the
filename against 'HKEY_USERS'. The backup names files after their source
path, so an operator pref captured from HKCU:\ lands in a file named
"HKCU_..." with content root HKEY_CURRENT_USER - which the filename match
missed entirely, dropping it from the restore.
Read each .reg once and classify by its content root(s):
[HKEY_CURRENT_USER... -> per-user, remap root to HKEY_USERS\<targetSid>
[HKEY_USERS\<srcSid>... -> per-user, remap srcSid -> targetSid
[HKEY_LOCAL_MACHINE... -> HKLM
The temp rewrite (UTF-16-LE for reg.exe import) is only written when the
content actually changes; otherwise the file imports as-is.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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