Setting NTFS rights to deny Delete permission

This can be done by editing the advanced security properties of the folder and files. To do this, right click on the folder in question and select "Properties." Select the Security tab and click "Advanced." Add or edit the appropriate users and specify the following permissions:

          Traverse Folder/Execute Data            List Folder/Read Data            Read Attributes            Read...

Extended Attributes            Create Files/Write Data            Create Folders/Append Data            Write Attributes            Write Extended Attributes            Read Permissions            Change Permissions

You may or may not need all of the above permissions for your specific requirements. The key is to remember to NOT grant the "Delete Subfolders and Files" and "Delete" permissions.

Keep in mind that you may need to remove inheritance to allow you to make the necessary changes.