: 64-bit cygwin - cannot remove group permissions from file on ntfs

[Luke Ordelmans]

Running cygwin 64-bit on Windows 8 doesn't allow me to remove group permissions from a file. On 32-bit cygwin doing the same thing works fine.
 
Luke@Sorcerer ~/test $ uname -a
CYGWIN_NT-6.2 Sorcerer 1.7.23(0.268/5/3) 2013-08-09 10:05 x86_64 Cygwin
Luke@Sorcerer ~/test $ touch test
Luke@Sorcerer ~/test $ chmod -c 600 test 
mode of `test' changed from 0660 (rw-rw----) to 0600 (rw-------)
Luke@Sorcerer ~/test $ ls -la total 4.0K
drwxrwx---+ 1 Luke None 0 Aug 11 15:40 ./
drwxrwxr-x+ 1 Luke None 0 Aug 11 15:40 ../
-rw-rw----Â  1 Luke None 0 Aug 11 15:40 test
Luke@Sorcerer ~/test $ umask
0077
 
Any help would be appreciated.

Regards,
Luke

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