DOS programs run in Windows™

The Grinder software program is a ol' DOS based  program that runs under Windows™ 3.x, 95, 98, WinXP, and Win7 legacy.

Remember, it is a DOS application and hasn't the Windows features
that many people demand. However, you will not find a program that
is as fast as the Grinder when inputting data and generating easy to
read reports. It's not unreasonable to enter in 250 lines in an hour.

There are still many original customers still using this program today.
I, myself use it regularly when preparing cost estimates.

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