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UNC hidden shares are improperly escaped
Typing the following
PS> dir \HOSTNAME\c$\<TAB><SELECT ANY ENTRY><ENTER>
causes the following:
PS> dir "\HOSTNAME\c`$\MyFavoriteDirectory"
Notice the extra backtick escaping the $, which is in fact part of the path.
UNC paths that contain $ as a valid part of their path are not escaped. This can be detected iff the $ immediately preceeds a \