Windows – How to Run PowerCalc (Power Calculator) on Windows 8

calculatorwindows 8

A while ago Microsoft released an upgrade to their Calc application for Win XP called PowerCalc. It was a great little calculator application with few bells and whistles but easy to use. Unfortunately, it was tied to Windows XP and would not work on any other windows machine. Several enterprising individuals hacked the executable to get the program working on Windows 7 and Vista. However I recently upgraded to Windows 8.

Has anyone figured out how to get PowerCalc to work on Windows 8?

Best Answer

I'm sure there's an easier way, but this is what worked for me...

  1. Download the Windows 8 SDK

  2. Install the SDK, then install Orca from

    C:\Program Files (x86)\Windows Kits\8.1\bin\x86\Orca-x86_en-us.msi

  3. Run the PowerCalc installer -- it will fail, but will extract the msi installer to

    C:\Windows\Downloaded Installations\Calculator Powertoy for Windows XP.msi

  4. Copy the msi to your Desktop

  5. Right click the copied msi and select "Edit with Orca"

  6. In Orca under the "LaunchCondition" table, delete the "VersionNT = 501" condition, then save and exit Orca

  7. Install PowerCalc from the modified msi

  8. Open PowerCalc.exe with a HEX editor such as PSPad


  9. In PSPad, select Search > Go to line $13E1, then replace 0F 84 B9 00 00 00 with 90 90 90 90 90 90

  10. Launch the powertoy calculator and enjoy!