WWW www3d = new WWW(_textFieldString);
yield return www3d;
string s = www3d.text;
file://S:/myfile.xml FAILS
file://C:/myfile.xml Succeeds
what gives??
If S: is a shared drive, perhaps Mono does not know how to access files across the network.
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Maybe your S drive has certain permissions that arent allowing Unity from accessing the files you want, seeing as C: is normally a local drive windows will access that easy I would check S: to make sure you have full windows permissions to access the file you want.