Can i set permissions on iis server with php?

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IIS

PHP

server

Microsoft

upload

I have a IIS Server and I have a KCFinder (combined with an CKEditor) to upload images and files over an editor.

When I upload an image it gets uploaded fine and I can see it. Other admin users can see it as well. But each other user that isn't in the admin group has no permissions to the file.

Can I set permissions with a PHP script, to give "IIS_IUSR" the neccessary rights? (As far as I know "chmod" isn't an option for IIS Server.)

What I have tried:

I tried to give "IIS_IUSR" the right to read & write for the upload folder and all its child elements. This works perfectly fine, until a new image or file will be uploaded by someone, which doesn't get the permissions of the home folder.
Of course I could just continue giving permissions manually all the time, but I need it to work even when I'm not around.

I tried to set the following Settings in ".\kcfinder\conf\config.php":

'dirPerms' => 0777,
'filePerms' => 0777,

-> Unfortunatelly nothing changed...

Any other ideas?