harry1999, The use of preposition is not really something that could be completely worked out and explained by formulas and reasons. A lot of it is often based on grammatical logic, sometimes idiomaticality and occasionally what sounds natural. Your questions: At vs to Export the imported file to the default location(folder).
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My understanding with the at vs to thing is the idea of where the travelling is heading. Eg, if the travel is ending in the location in the sentence, you would use 'to'. If the travel was continuing it would be 'at'. Example:
Jim arrived to the factory - Jim's final destination was the factory
Jim arrived at the factory - Jim is merely stopping at the factory but will travel elsewh