[ubuntu-za] MOVING A FILE USING MV?

[vincent]

I've downloaded a file, "wine_gecko-0.1.0.cab" to my desktop & am now trying 
to move it to /usr/share//wine/gecko/

According to the instructions from sourceforge I need to      
mkdir  /usr/share/wine/gecko which I've done & then
mv wine_gecko-0.1.0.cab /usr/share/wine/gecko/

As root I've done step 1 successfully & created the directory, however every 
time I try to mv I get an error message as follows:
"mv:  cannot stat 'wine_gecko-0.1.0.cab' : no such file or directory" & yet 
it's laying there looking at me on the desktop!

I'm using 8.04.2. Help please.
TIA
Vince