spaces in file name

Hi All,

I am stuck on parsing file name if it has space.
I have file name as : file system.proj
now this file contains space between worf file and system
now i want to do ceratin operation on this file
but whenever i give this file name in any command then it fails saying that file does not exist. it is only considering file word and not the whle file name.
i dont know how to handle this sitiuation . i tried applying double quotes to file name but no luck.
here is my actual code:
$vd="file system.proj";
 $svn = "svn delete $vd";
    if (system($svn)) {
  print "Deletion of vdproj file failed\n";
  exit 1;

plz advide