However, the situation is that ehe spaces not from my filename but from the Windows XP default of C:\Documents and Settings\Default user\..... etc. I guess in an overwhelming web-based environment using Windows at the browser side, most people would come across this issue. I'm wondering if there is something else would make IE returns the path just liked Firefox that has no problem at all.
You should never make any assumptions about the filename the client might send. The backslashes are legal filename chars in Unix, but if you don't want them, just strip them off.
$filename =~ s/.*[\\\/]//;
You should check whatever's left against the set of characters you want to allow.
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