[hasherfrog]

Код:

@ver > ver.txt 
@find "Microsoft Windows XP" ver.txt 
@if errorlevel 1 goto win98_actions else goto winxp_actions 
:win98_actions 
. . . 
 
@goto exti_here 
:winxp_actions 
. . . 
 
@goto exit_here 
. . . 
 
exit_here: 
@del ver.txt

[DAnG]

так быстрее:

Код:

 
@if .%OS% == .Windows_NT goto l_nt 
@goto l_win9x 
:l_nt 
..... NT commands 
@goto l_exit 
:l_win9x 
..... win9x commands 
:l_exit

[Diesel]

Спасибо огромное!