file-error "doing chmod" "permission denied" issue

[susja]

Hello,
I'm using cygwin 64bit on Windows 7.
I'm using X-emacs under cygwin.
In emacs I use eshell.
When I open text file and modify it and then save I have this error:
Error: (file-error "doing chmod" "permission denied" "<file_name>")
I followed all instructions to setup cygwin permission but still have this 
issue.
Note: despite I see that error actually file get saved and I have a backup 
of it in emacs hence it looks to me that message is innocent ... but 
anyway it's annoying.
Could anyone suggest how to fix it?
Thanks


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