Is it possible to change to winver windows 2000 style?

Yeah, that's a standard dialog resource. You should be able to change that by modifying either %SystemRoot%\System32\en-US\shell32.dll.mui (replace "en-US" with your current system locale if necessary) for most versions of Windows, or %SystemRoot%\SystemResources\shell32.dll.mun if you're using a newer version of Windows 10. There have been a few different iterations of winver over the years, so here are a few of them that were put together in this thread. These should work with any version of Windows from Windows 7 and onwards:


Windows 2000

Code:
14352 DIALOGEX 20, 20, 275, 140
STYLE DS_SHELLFONT | DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "About %s"
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
FONT 8, "MS Shell Dlg"
{
  CONTROL 0, 12297, STATIC, SS_ICON | WS_CHILD | WS_VISIBLE, 21, 7, 18, 20
  CONTROL "", 13568, STATIC, SS_LEFTNOWORDWRAP | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 7, 165, 10
  CONTROL "", 13579, STATIC, SS_LEFTNOWORDWRAP | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 17, 150, 10
  CONTROL "", 13578, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 28, 205, 10
  CONTROL "", 13581, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 38, 145, 20
  CONTROL "This product is licensed to:", 13586, "SysLink", WS_CHILD | WS_VISIBLE | 0x80, 70, 57, 145, 10
  CONTROL "user name", 13575, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 68, 145, 10
  CONTROL "org name", 13576, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 78, 145, 10
  CONTROL "", 13095, STATIC, SS_ETCHEDHORZ | WS_CHILD | WS_VISIBLE, 70, 90, 198, 1
  CONTROL "Physical memory available to Windows:", 13570, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 95, 230, 10
  CONTROL "", 13571, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 202, 95, 53, 10
  CONTROL "OK", 1, BUTTON, BS_DEFPUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP, 220, 121, 50, 14
}


Windows XP (SP1 and earlier)
    
Code:
14352 DIALOGEX 20, 20, 275, 150
STYLE DS_SHELLFONT | DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "About %s"
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
FONT 8, "MS Shell Dlg"
{
  CONTROL 0, 12297, STATIC, SS_ICON | SS_REALSIZECONTROL | WS_CHILD | WS_VISIBLE, 21, 7, 21, 20
  CONTROL "Microsoft \xAE %s", 13568, STATIC, SS_LEFTNOWORDWRAP | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 7, 165, 10
  CONTROL "", 13579, STATIC, SS_LEFTNOWORDWRAP | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 18, 200, 10
  CONTROL "Copyright \xA9 %s Microsoft Corporation", 13578, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 28, 175, 10
  CONTROL "", 13581, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 38, 145, 20
  CONTROL "This product is licensed under the terms of the <A>End-User License Agreement</A> to:", 13586, "SysLink", WS_CHILD | WS_VISIBLE, 70, 58, 145, 20
  CONTROL "user name", 13575, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 80, 78, 145, 10
  CONTROL "org name", 13576, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 80, 87, 145, 10
  CONTROL "", 13095, STATIC, SS_ETCHEDHORZ | WS_CHILD | WS_VISIBLE, 70, 100, 199, 1
  CONTROL "Physical memory available to Windows:", 13570, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 70, 105, 130, 10
  CONTROL "", 13571, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 202, 105, 53, 10
  CONTROL "OK", 1, BUTTON, BS_DEFPUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP, 220, 130, 50, 14
}


Windows Server 2003/Windows XP (SP2 and later)

Code:
14352 DIALOGEX 20, 20, 275, 151
STYLE DS_SHELLFONT | DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "About %s"
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
FONT 8, "MS Shell Dlg"
{
  CONTROL 0, 12297, STATIC, SS_ICON | SS_REALSIZECONTROL | WS_CHILD | WS_VISIBLE, 7, 7, 21, 20
  CONTROL "", 13568, STATIC, SS_LEFTNOWORDWRAP | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 35, 7, 200, 10
  CONTROL "", 13579, STATIC, SS_LEFTNOWORDWRAP | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 36, 18, 235, 10
  CONTROL "", 13578, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 35, 28, 210, 10
  CONTROL "", 13581, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 35, 38, 180, 20
  CONTROL "This product is licensed under the terms of the <A>End-User License Agreement</A> to:", 13586, "SysLink", WS_CHILD | WS_VISIBLE, 35, 58, 180, 20
  CONTROL "user name", 13575, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 45, 78, 180, 10
  CONTROL "org name", 13576, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 45, 87, 180, 10
  CONTROL "", 13095, STATIC, SS_ETCHEDHORZ | WS_CHILD | WS_VISIBLE, 35, 100, 234, 1
  CONTROL "Physical memory available to Windows:", 13570, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 35, 105, 130, 10
  CONTROL "", 13571, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 167, 105, 88, 10
  CONTROL "OK", 1, BUTTON, BS_DEFPUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP, 220, 130, 50, 14
}


Windows Vista

Code:
14352 DIALOGEX 20, 20, 275, 191
STYLE DS_SHELLFONT | DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "About %s"
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
FONT 8, "MS Shell Dlg"
{
  CONTROL 0, 12297, STATIC, SS_ICON | SS_REALSIZECONTROL | WS_CHILD | WS_VISIBLE, 7, 7, 21, 20
  CONTROL "", 13568, STATIC, SS_LEFTNOWORDWRAP | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 35, 7, 200, 10
  CONTROL "", 13579, STATIC, SS_LEFTNOWORDWRAP | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 35, 18, 235, 10
  CONTROL "", 13578, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 35, 28, 210, 10
  CONTROL "The %WINDOWS_LONG% operating system and its user interface are protected by trademark and other pending or existing intellectual property rights in the United States and other countries.", 13587, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 35, 38, 210, 40
  CONTROL "", 13581, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 35, 78, 180, 20
  CONTROL "This product is licensed under the <A>Microsoft Software License Terms</A> to:", 13586, "SysLink", WS_CHILD | WS_VISIBLE | WS_TABSTOP, 35, 98, 180, 20
  CONTROL "user name", 13575, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 45, 118, 180, 10
  CONTROL "org name", 13576, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 45, 127, 180, 10
  CONTROL "", 13095, STATIC, SS_ETCHEDHORZ | WS_CHILD | WS_VISIBLE, 35, 140, 234, 1
  CONTROL "Physical memory available to %s: %s KB", 13571, STATIC, SS_LEFT | SS_NOPREFIX | WS_CHILD | WS_VISIBLE, 35, 145, 230, 10
  CONTROL "OK", 1, BUTTON, BS_DEFPUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP, 220, 170, 50, 14
}

Do you have Windows 2000 Korea version winver?
The system locale (Korean) is Korea.