That sounds like it should work, just put the new MSCDEX.EXE in the same directory that the old version was (rename the old version so you still have it if you want) and when you run the installation diskette that came with the new CDROM, it should detect that you have the new version and finish the installation process.

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Am386DX-40 + Cx387DX-40
32MB, 128KB cache
(2) 540MB HD's
8x CD
2MB Video
SB16 PnP
DR-DOS 7.04
Win3.11 w/ Win32s
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Just because it's unusual doesn't make it a virus!
Ping is NOT an acronym!