Thanks for all the suggestions. I also know that XP is not built on a DOS base, but it does have the ability to open a DOS type window in response to the CMD command. Using CMD, I can see the message being produced which is "This program cannot run in DOS mode". Also, using VEDIT, I can see that this message is contained within the program. The same results are obtained under Win98se, and after booting into DOS.
I have tried downloading the file several times with both XP and NT, and it always comes down as JOHNSON.EXE. Again using VEDIT, I found text in the file indicating that it is a self extracting file built by Winzip with a 1995,96 copyright. However, the current version of Winzip (8.1) fails to extract the data. It reports that the file is 154 bytes short, then says it is corrupted and cannot be extracted.