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Hallo Mofi, hallo Bego, thanks for all the things you do to solve may problem. It seems to be christmas :-) I know, it takes time to find the right code, so thanks again. @Mofi: I have tested you macro. I have entered a blank line in each row, like this 1101340," bla bla 1104603," bla bla 1107341," ...

Hello, I have to cleand up many files. Is it possible by using a macro to doing something like that? I only want to delete lines in File 2, who have an entry in File1. For Example: File1: 400 entries 2104677 --- this customer should be deleted in File2 2184943 1391879 2351252 4248990 1408022 1409449...