New installation of Cygwin64: xinit.sh exit code 3

[Fergus Daly]

<< Detail >>

>> When I used Explorer to visit C:\ProgramData\Microsoft\Windows\Start Menu\Cygwin-X I was told:
>> "You don't currently have permission to access this folder"
>> and clicking on Continue to get access I was told:
>> "You have been denied permission to access this folder"
>>There was then offered an option to edit Permissions which I didn't feel like pursuing.
>> (I am the Administrator on my own standalone Windows machine. The denial of access to Cygwin-X feels odd.
>> PS I also have Cygwin32 installed and running. I _am_ permitted access to the equivalent folder Cygwin-X (32-bit).)

> Please try running the following command/s, under Cygwin 32 and 64, and posting 
> the outputs:

> $ for p in "`cygpath -A -P -U`"{,/Cygwin-X}; do for c in 'lsattr -d' 'ls -dl' 
> getfacl; do $c "$p"; echo; done; icacls "`cygpath -m "$p"`"; done

Thank you. (Again.)
1. Actually before reading this I had deleted both folders
(successfully, despite not being permitted entry into one 
of them) and the re-ran the xinit installation with no
bother at all. 
I'm guessing the Permissions glitch resulted from some local
recent accidental keypress or sequence.
2. icacls? Haven't got this though I have got getfacl; found icacl in 
"Search packages" under libattica-devel and ng-spice-debuginfo?