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Tested on Windows 95:

The SDK (10MB) contains the folder bin/PackSign which has the signing programs.

Download SDK - Get SDK-java.exe, then Install (double click the file)

You can delete SDK-java.exe from the download folder after unzipping or you may wish to move it to the /SDK-Java.202/Zip folder.
Msoft signtool
Below are some documentation files I found. These are only on my local machine.

SDK 3.2 Documentation

SDK 2.0 Documentation