assuming i set %filename to "C:\Documents and Settings\User" that your creates to me a variable like this:
%filename: " C:\Documents and Settings\User N/A C:\Documents and Settings\User\
are u sure that sub should work this way?
anyway i got your directions and remembered what was my real problem, trying time ago...
i wrote down this:
set %filepath C:\Users\Riccardo\Desktop\Programmi\Easyuo\
set %filename %filepath , menuscript.gif
menu Window Size 264 384
menu Image Create Plant 0 0 400 400
Menu Image File Plant 25 40 %Filename
menu show 300 300
and that's the result:

note that the original image size was 260x380 and 264x384 for menu... as you can see the image has been resized through easyuo rendering.
i'm wondering if this issue is caused by win7 or is easyuo bugged, i can't try this for at least a week since i'm with my laptop @ university apartment and cannot reach my old PC running XP.
if someone wants to try please let me know, i leave the pic in attachment and the script is written above.