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This VI demonstrates how to drag and drop a file into the file path control and then programmatically check that file to make sure that it has a particular extension.
There is no event in LabVIEW that handles a "drag-n-drop" event, but because string, file, and path I/O controls allow drag-n-drop of file names, the workaround is to handle the "Value Change" event on a particular I/O control and then handle the file extension of the file name that was added.
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