After more than two weeks of investigations my customer has solved this mystery by chance. The "simple" solution was, that his C: drive was write protected for the Admin. Unfortunately my customer couldn't tell me why and how this has happened, so this mystery stays, especially because he has successfully setup my App on C:, but the second install part, installation of my App videos was already blocked. Very strange, but... Thanks Jim and Börnke for your help! Tiemo
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