How To make a File Non-Deletable , but Writable Over a Sharing Zone.

Hi Everyone

I am trying to make a file that are in a sharing Zone but i don't know someone delete my files. That's Why i need to protect my files using permission. I tried several times to change the special permission , but "full control" is default. so if i change the permission is denied then it won't work over sharing Zone.

Need Help.

Thanks In Advance for Help

i solved it by analyzing permission. if anyone need it then mail me.

Just Remove "Everyone" in permission and in security and add your logon ID on both with full control.