read here for the text plus graphical screenshots,
http://anyweb.kicks-ass.net/SecureXP/disableAccess.htm
text only below, obviously, replace CMD.EXE with TFTP.EXE:-
cheers
anyweb
http://anyweb.kicks-ass.net
Disable access to a file.
To disable a file (i.e. to Deny access to a file), do the following:
1.) In the example below, we are going to deny access to the file
"CMD.EXE". Right click on the file in Explorer, and choose "Properties",
as shown in the figure.
2.) Click on the Security tab, and then click on the Add button as shown
in the figure. If you don't have a Security tab, your are probably not
using NTFS. If so, it is strongly recommended that you upgrade to NTFS
(using the convert /FS:NTFS command) so that you can use file permissions.
3.) In the Empty box provided, type Everyone and then click "Check
Names", once Everyone is underlined click on the OK button.
4.) Click on the "Everyone" Group, and then click on the Deny "Full
Control" checkbox, as shown in the figure.
5.) Click on the OK Button.
6.) To verify that it has worked, click Start/RUN and type CMD. If you
did the above correctly you should see the following error.
Close Window