I know I can write a custom dialog to do what I'm looking for, but is it possible to set a filter with OpenFileDialog to get .txt files, but only if they doesn't have "_org" in the filename?
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Hey you can subscribe the OpenFileDialog.FileOk-Event to check the user selection of file names. if any filename incorrect you can cancel the event an show a message! otherwise you must write a custom dialog.

Lutze
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It is not possible with Basic OpenFileDialog's Filter property as it just filters list of files based on their extension.

Pankaj
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