in software sources i see a lot of links that don't link to lanchpad.net

http://deb.playonlinux.com/ oreiric main
http://dl.google.com/linuxearth/deb/ stable main
http://linux.dropbox.com/ubuntu precise main

i was wondering: can i add a regular download link in my sources.list.
here is what i mean to do.
this is the download link for notepad++(an example)

http://download.tuxfamily.org/notepadplus/6.1.3/npp.6.1.3.Installer.exe

i wonder can i add this(or an other) link to download the latest version of notepad++(or any software for that matter) and every time
there is a new version of notepad++ i can install the latest via update-manager.
this is exactly when adding vlc(A example) in the sources.list. And when the software.
has been downloaded to run a command like wine npp.6.1.3.Installer.exe /S /Silent
for silent installation.