There are three ways to do so.
1) Find somebody, who has the same lokale as you do, and politely ask him to do this for you.
2) Learn yourself how to use OpenSSH and WINSCP(I believe you need both for this procedure).
3) Try to do this through "Mass Storage Mode", which isn't hard either. Just read the instructions carefully, and you will understand everything. Considering your Posts/Thanked ratio, I assume, you DO know how to do stuff with n900!

I personally would prefer the second one, for three reasons:
a) If you really want to stay in this community, you gotta learn stuff.
b) You are going to need these skillz in some other further stuff.
c) WinSCP and OpenSSH are really usefull programms, that allow you to access your n900 remotely via WiFi.