4nt from 2.5 onwards work under windows 7. I still use 4nt/tcmd 8.01, since that gives me three separate prompts. tcmd 8.01 is mostly for starting other programs, and running my rexx calculator when cut and paste it.
I upgrade various windows proggies, and you should hardly want tcc to fall over for a windows upgrade or whatever.
4DOS 4OS2/4NT TCMD
v10 4.00 1.00 12a b
v20 5.00 2.00 12a b 1 OS/2 16-bit
v25 5.50 2.50 12a 1.00 2w b 2 OS/2 32-bit
v30 6.00 3.00 2a 2.00 2wa ri a w32 ASCII (9x)
v40 7.00 4.00 a 3.00 a r u w32 Unicode (NT)
v50 7.50 5.00 au 5.00 au r w w16
v60 -TCI- 6.00 au 6.00 au r b brand
v70 1.00 7.00 u 7.00 u r r registry key
v80 2.00 8.00 u 8.00 u ri i inifile
v90 9.00 u ri
This table shows the various releases to vers 9.0 (after which would not run on W2K). 'a' versions run under win 9x/nt 4,5.0. u versions run on vista (6.x+, never got into xp).