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The NetBeans menu in XEmacs has a "Mount File" item. That's misleading - you can't mount -files- in NetBeans, only filesystems (e.g. directories, sets of files). I think this should be renamed to something like "Mount File's Directory" (that -is- what it does, right?) It should probably also have the side effect of selecting the file in the explorer within the newly mounted file system.
Fixed the name. Will look into the required side effect.
The selected file in the newly mounted filesystem should be highlighted. If the filesystem was already mounted before, it should still highlight the filename.
Follow ISSUE #20486 about how to select the file in Explorer
With the help of David Konecny's hack (see issue 6559, attachment ShowInExplorer.jar), we can now get the Explorer to open to the file and select it.