You need to provide the full path to the output file when saving, instead of only the file name. If your %CurrentItem% targets a file stored in, e.g. "C:\RPA\Files\test.xls", then %CurrentItem.NameWithoutExtension% will only contain "test". Instead, you should use %CurrentItem.Directory%\%CurrentItem.NameWithoutExtension% to include the full path, except for the file extension.
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