Why are there duplicate desktop configuration files in /usr/share/applications/ ?

[Detlef Lechner]

Hello,

Why does the Nautilus file browser display duplicate desktop 
configuration file names in /usr/share/applications/ , for example 
"Brasero"? Nautilus  displays also identical Size, Type, Date Modified 
and owner, but the sizes are different.
'T43:/usr/share/applications$ ls -l | grep brasero
-rw-r--r-- 1 root root  3160 2009-10-30 10:20 brasero-copy-medium.desktop
-rw-r--r-- 1 root root  3859 2009-10-30 10:20 brasero.desktop
-rw-r--r-- 1 root root   504 2009-10-30 10:20 brasero-nautilus.desktop'

Kind regards,
Detlef Lechner