How do I prevent Chrome from accessing files?

I want Chrome to not be able to access the whole file:// thing, for example file:///C:/Users/SuperUser/Desktop/test.pdf. How do I go about this? I ha

Actually it doesn't work in the latest Chrome (or any gt 28), supposedly you can use a GPO and it works... [HKEY_LOCAL_MACHINESoftwarePoliciesGoogleChromeURLBlacklist] new string value 1 ->file:// 2 ->file:/// 3 ->file:///C:/

But this did not work because under Policies there was no Google, just adobe and microsoft.

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