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Try cleaning the inner and outer scrub moldings on the door. Theyre the 2 felt lined moldings that ride against the glass on the inside and the outside. Dont lube them just clean them with glass cleaner
 

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As above or open window fully and run a blunt thin blade along the rubber moulding to remove any rubbish.

My e34 does this on the passenger side and a good scrape keeps it quite for a while.

The rubber mouldings go hard with age and get a sort of green growth on them,and then when opening the window they try to fold over on themselves which is what the noise is,rubber against glass.
 
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