What files to modify for the settings of Safari Prefs using plist editor ?

Question

I'm running into a situation that the default "Save downloaded files to"
for some unknown reason has been changed to the hard disk top level of Desktop which caused all users can't download (permission error). I knew this can
be fixed by the logged user by going to Safari's General Preference and change
to the desired location. However, I need to use the "Property List Editor"
to modify the preferences file(s) for all users ! as I have a customized
/System/Library/User\ Template/English.lproj which contains a Safari folder
under /System/Library/user\ template/English.lproj/Library. There is file called "Downloads.plist" under the Safari folder, I examined this file using
"Property List Editor", it contains the following two lines:
<key>DownloadEntryPath</key>
<string>~/Desktop/fdmacosx.sit</string>
I am not sure if the above two entries are for the "Save downloaded files to"
setting in Safari GUI Preferences setting. If they are, then they should point
to the logged user's home directory's Desktop (Not points to the drive top level)which should be correct. BUT all subsequent created users STILL point to the drive top level Desktop (with Red stop sign in the icon)in Safari's Preferences.
I also looked in the /System/Library/user\ template/English.lproj/Library/Preferences/com.apple.Safari.plist, nothing related to the "Save downloaded files to".
Where to look for the Preferences file(s) for this setting ?
DC

Answer 1

Found nothing related to the "Save downloaded files to" preferences setting
in ~/Library/Preferences/com.apple.Safari.plist. what is the entry in
~/Library/Preferences/com.apple.Safari.plist ? Should not be in the logged user
Preferences file, I'm looking for system wide plist file.
-DC