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Wing shouldn't be opening a file twice. However, if there are multiple editor splits, it does show open files in all splits by default. You can right-click on the editor tab area and uncheck Show All Files in All Splits to have each split act independently, with its own set of files.
If it is actually opening a file twice in the same split, could you please submit a bug report from Wing's Help menu and include the error log so we can see if what is going on.