Lotus 123 Windows 10 — [portable]
A benchmark conducted on an Intel Core i5-8250U running Windows 10 22H2 showed:
Windows 10 is a 64-bit operating system that has dropped support for the 16-bit subsystems present in 32-bit versions of Windows XP and earlier. Lotus 1-2-3 releases 1.x through 3.x are 16-bit applications. Consequently, attempting to launch a 16-bit Lotus executable on 64-bit Windows 10 yields the error: “This app can’t run on your PC.” Even the last 32-bit version (Lotus SmartSuite Millenium Edition, release 9.8) suffers from graphical glitches, broken printing, and failure to register OLE components due to deprecated security models and missing 16-bit installer stubs. lotus 123 windows 10
The inability to run original software on modern OSes risks losing the ability to verify computational results from historical spreadsheets. Financial audits, engineering calculations, and scientific data from the 1980s–1990s may depend on specific quirks of Lotus’s floating-point implementation (e.g., different rounding behavior from Excel). Running original binary code in a controlled emulator is the only method that guarantees bit-exact reproducibility. A benchmark conducted on an Intel Core i5-8250U
Given the challenges and limitations of running Lotus 1-2-3 on Windows 10, many users consider migrating to modern spreadsheet software alternatives, such as: The inability to run original software on modern