File Extension Library

.12M File Extension

  • Developer by: IBM
  • Category: Spreadsheet Files

What are .12M files and how to open them?

Can't open .12M file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .12M file.

What is a .12M file extension?

.12M file extension is created by IBM. .12M has been classified as Spreadsheet Files.

.12M is Lotus 1-2-3 SmartMaster File

A 12M file is a spreadsheet created by Lotus 1-2-3, which is part of IBM Lotus SmartSuite. It contains a pre-designed spreadsheet that allows a user to enter information to create forecasts, financial statements, and budgets. 12M files also include formulas, formatting, and print ranges.

Lotus 1-2-3 was first developed by Lotus Development Corporation, which was bought by IBM in 1995. The "1-2-3" refers to the program's three main capabilities: 1) spreadsheet functions, 2) creating charts and graphs, and 3) basic database operations.

NOTE: Lotus 1-2-3 was popular in the 1980s and early-90s. However, it was overtaken by Microsoft Excel in the 90s and was officially discontinued in 2013.

List of all softwares that can open the Lotus 1-2-3 SmartMaster File
IBM Collaboration Solutions

How to fix problems with .12M files

  1. You need to update the application that you normally use to open .12M files. Only the latest version of the software supports the current .12M file format
  2. You need to check the .12M file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)