Here's the contents of my batch file called "subst.bat", shortcutted to in the startup folder, as in the end of the steam tutorial:
@ECHO OFF
subst s: "c:program filessteamsteamappsmycokerewards"
CLS
EXIT
If I paste the command directly into the dos prompt, it works fine, but if I double-click the batch file, or leave try to run through the startup folder, it doesn't work... the dos window just seems to hang there doing nothin...