My experience has been that cygwin can open (for reading) any file that you can use the GUI to drag-and-drop-copy, but it cannot open any file that the GUI will not drag-and-drop copy.
Example: you're downloading a large MPEG using IE. WMP will refuse to open the partial file because it's locked to some extent - but you can use the GUI to make a copy of the partial file, and WMP will then open the copy.
Some other files, however - for instance Outlook .PST files - are absolutely uncopyable using the GUI when they are locked by the processes that play with them.
My experience is that cygwin can open files that are locked read-only - like partial IE downloads - but CANNOT open files that are completely locked - like Outlook's .PSTs.
Please keep us posted how your research on this stuff turns out.
-J
> I've received a reply from the Cygwin people that suggests > Cygwin _always_ uses backup semantics, and a little information > about how. It's some pretty hairy code and I'm still deciphering > it, but it could be that I was authoring that patch for nothing. > I'll post more when I figure it out.
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