Provided filter string is not valid. A filter string should contain a description of the filter, followed by a vertical bar ...

Provided filter string is not valid. A filter string should contain a description of the filter, followed by a vertical bar and the filter pattern. You must also separate multiple filter description and pattern pairs with a vertical bar, and you must separate multiple extensions in a filter pattern with a semicolon. Example: \"Image files (*.bmp, *.jpg)|*.bmp;*.jpg|All files (*.*)|*.*\
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