Just to keep the lists that MarcElBichon and Sharky_Canada posted of "original" Systernal files still available on the M$ server more complete, I add the following ones, I believe were not included on those lists.
http://www.sysinternals.com/Files/DebugView9x.zip
http://www.sysinternals.com/Files/DebugViewNT.zip
http://www.sysinternals.com/Files/Defrag.zip
http://www.sysinternals.com/Files/Diskkey.zip
http://www.sysinternals.com/Files/Filemonamd64.zip
http://www.sysinternals.com/Files/fmifs.zip
http://www.sysinternals.com/Files/Native.zip
http://www.sysinternals.com/Files/secdemosource.zip
http://www.sysinternals.com/Files/secdemo.zip
http://www.sysinternals.com/Files/TVCache.zip
http://www.sysinternals.com/Files/VCMon.zip
http://www.sysinternals.com/Files/VCMonsource.zip
http://www.sysinternals.com/Files/VXDMon.zip
http://www.sysinternals.com/Files/VxDMonsource.zip
Some of these files are outdated by updates which apparently work on multiple systems, such a Debugview, Filemon, and Regmon, but they are included for the sake of completion of potential files still available.
Again, none of these include any of the "How to" instructions for the tools, which ARE available in the files I've uploaded to the Server. Those files are available for the "current" tools on the M$ site.
Regards,