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For each filtering option, the filter string contains a description of the filter, followed by the vertical bar ( ) and the filter pattern. The strings for different filtering options are separated by the vertical bar. The following is an example of a filter string: Text files (.txt).txt All files (.). You can add several filter patterns to a filter by separating the file types with semicolons, for example: Image Files(.BMP;.JPG;.GIF).BMP;.JPG;.GIF All files (.). Use the property to set which filtering option is shown first to the user.

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OpenFileDialog Component Overview (Windows Forms). It is the same Open File dialog box exposed. The Filter property sets the current file name filter. Extend OpenFileDialog and SaveFileDialog the easy way. If you used WinForms. If you double click on the title bar of the file open dialog.