The File Extensions Database

.FM3 File Extension

  • Developer by: IBM
  • Category: Settings Files
  • Format: Binary

What is an .FM3 file?

.FM3 is Lotus 1-2-3 Spreadsheet Format File

File created by older versions of the Lotus 1-2-3 spreadsheet software; contains the display formatting for a .WK3 worksheet; can include formatting data for cells, borders, fonts, shading, and other display elements; can be opened by some older versions of Microsoft Excel.

Even though Lotus 1-2-3 separated out the formatting information for some spreadsheet files, recent spreadsheet applications do not use this convention.

Programs that open Lotus 1-2-3 Spreadsheet Format File
IBM Collaboration Solutions
Microsoft Excel 2016

How to solve problems with FM3 files

  • Associate the FM3 file extension with the correct application. On :
    Windows: Right click on any FM3 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.FM3 files". Mac: Right click (or Ctrl-click) the FM3 file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .FM3 is Lotus 1-2-3 Spreadsheet Format File. Because only the current version supports the latest FM3 file format. Search, therefore, e.g. on the IBM manufacturer website after an available .FM3 is Lotus 1-2-3 Spreadsheet Format File update.
  • To make sure that your FM3 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.