Slide Tuning Question

[And6]

I'm trying to play the slide guitar part to Sheryl Crow's "All I Want To Do" song.  Does anyone have a clue what tuning if other than standard is used?  I appreciate your help.

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[Chris C]

In the official video there's a guy playing steel guitar, but you could probably duplicate the sound with your guitar in open D or open E, as the highest note in the chords you hear are the high octave of the root note.