With Open Xlsx PLUS, you can not only create and edit Excel Spreadsheet documents (.xlsx and .xls) directly, but also open many more common spreadsheet document formats (.ods, .wks and etc.).

Support formats:

.ods, .ots, .oxc, .stc, .fods, .xml, .xlsx, .xltx, .xltm, .xlsb, .xls, .xlc, .xlm, .xlw, .xlk, .et, .xlt, .ett, .dif, .wk1, .wks, .123, .wb2, .csv