Can't copy file even with Admin permissions

Can't copy file even with Admin permissions

[cygwin]

I have file: /c/Config.Msi/3da9e136.rbf that I cannot copy, even when
I run bash as an administrator -- seemingly due to perm/acl errors.

Specifically:
	# mv 3da9e136.rbf newfile: works
	# cp 3da9e136.rbf newfile: works

But,
	# cp -a 3da9e136.rbf newfile
	cp: preserving permissions for ‘newfile’: Permission denied
	(though the file is created)

If I then do
	# getfacl 3da9e136.rbf | setfacl -f - newfile
	setfacl: more than one user entry.

And:
	# getfacl 3da9e136.rbf
	# file: 3da9e136.rbf
	# owner: Administrators
	# group: SYSTEM
	user::rwx
	group::rwx
	other::r-x
	user::rwx
	group::rwx
	group:SYSTEM:rwx
	mask::rwx
	other::r-x

While:
	# getfacl newfile
	# file: newfile
	# owner: Administrators
	# group: SYSTEM
	user::rwx
	group::rwx
	other::r-x


So the problem seems to be that the 'user' (and presumably also the
'group' and 'other') ACLs are duplicated.

- Is this a bug? (or a feature?)
- Any idea how or why this happened?
- Any idea how (or whether) to fix?