Lotus 1-2-3 3.x (DOS)

This is about the page at https://winworldpc.com/product/lotus-1-2-3/3x

The download section has both a 3.4 and a 3.4A version. Both are for DOS. What is the difference? Also, are there any suggestions about how to run it on the 64-bit version of Windows 7?
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