missing files to find:
nt4sp3_a.128.exe - 25,740 Kb
nt4sp3_i.128.exe - 18,430 Kb

old, dead links to the files:
http://download.microsoft.com/download/winntsp/SP/SP3-128/NT4ALPHA/EN-US/nt4sp3_a.128.exe
http://mssjus.www.conxion.com/download/winntsp/sp/sp3-128/nt4alpha/en-us/nt4sp3_a.128.exe
http://download.microsoft.com/download/winntsp/SP/SP3-128/NT4ALPHA/EN-US/nt4sp3_i.128.exe
http://mssjus.www.conxion.com/download/winntsp/SP/SP3-128/NT4ALPHA/EN-US/nt4sp3_i.128.exe