Android : File handle to Android resource via URI

On various answers on stackoverflow I have found a way to access an Android raw resource via file handle:

Uri uri = Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.wikipedia);
File file = new File(uri.getPath());
Log.v("MyActivity", "File exists: " + file.exists());

I have also tried:

Uri uri = Uri.parse("android.resource://" + getPackageName() + "/raw/wikipedia.png");
File file = new File(uri.getPath());
Log.v("MyActivity", "File exists: " + file.exists());

Tried hard coding the package name and/or using uri.toString() as well.

But I never get a file handle, the log always states:

V/MyActivity﹕ File exists: false

What am I doing wrong?

This is a blank application, I just copied any random file to the raw folder.

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Why I need a file handle? Because in my application, I have a pretty big raw file that that I don't want to copy first via InputStream, but the library I am using requires a file handle.