NTFS permissions 2000 server

Hello, we have been overhauling our fileserver to get stuff where it should be and to set permissions as they should be. In that process, I have run into a problem.

We are supposed to have some folders for certain folks to access for read and write. But we prefer they can only open and change files that they themselves created. I have not been able to get permissins to work for this. If I make a folder that has permission for a group of people to make files in, and they can read each others files, well they end up also able to change those files - even though they may not have authored them.

We want a folder where you can read any of the files but only save changes to your own created ones. I am talking about non-executable stuff.

Does windows allow for this, ar is this require something like individual files having to be password protected by each user?

I am familiar with the NTFS permission levels. Seems when you allow 'write' that then the users can write over any file in the folder - not just their own. Do I have to make subfolders that allow one person to write and all others only read?

Thanks for the input.

Troy