You tried to open a Lotus 1-2-3 FMT or FM3 file created by the Impress add-in. Microsoft Office Excel uses these files for ...

You tried to open a Lotus 1-2-3 FMT or FM3 file created by the Impress add-in.   Microsoft Office Excel uses these files for formatting information, but cannot open them directly. Instead, open the WK1 or WK3 file associated with the FMT or FM3 file you want. The corresponding FMT or FM3 file information will be incorporated when the file is opened in Microsoft Office Excel.