Open 123 File

The files that have the 123 extension have various uses, of a different nature, some of them below:

Lotus 1-2-3 Spreadsheet

In this section, file extension 123 is a spreadsheet file created by older versions of Lotus 1-2-3, and that format is no longer supported.

Lotus 1-2-3 was one of the first spreadsheet applications available for MS-DOS and on early Windows-based computers.

It became popular in the late 1980s, replacing VisiCalc.

Since Lotus 1-2-3 is no longer available, it indicates that the 123 extension format is no longer available as well.

PCB123 Circuit Board Design

In this section, file 123 is a printed circuit board or PCB layout, created with PCB123, a PCB layout program.

PCB123 is an industrially used electronic board design program developed by Sunstone Circuits.

File 123 contains a circuit board layout, which can include multiple components, and supports 2-, 4-, and 6-layer circuit boards with solder-mask and silk-screen options.

Completed PCB123 designs can be sent to Sunstone Circuits for manufacturing.

Assembly budgets are included in the program.

Software to open and work with a 123 file

Due to the diversity of formats associated with the 123 extension, you must first make sure of the file type, and then have one of the following software packages:

• Lotus 1-2-3 (Discontinued)
• PCB123