Read-only really means that you can't edit a file. It doesn't stop you from overwriting or deleting a file. You'd need to get into network permissions to do that.

>I use SetFileAttributes API to set file's read-only attribute. I test 'read-only' from Dos command line and a file was read-only. I could not overwrite it with a copy. But in NT Explorer I overwrote it with no problem. Am I mssing something?
>Thanks Mark