While I haven't yet confirmed all the details, it appears that Internet Explorer 
(but not other popular browsers?) mis-executes single-file Tcl-based executables
when it attempts to "Run" them on downloading.  To "Save" and "Open" them is fine.
This suggests, as [GWL] first observed, that IE is establishing its own [VFS], or
at least doing something (with %TEMP%?) to make life hard for the ones in 
[starpack]s or [Freewrap].
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