Remove MSW code targeted at versions prior to WinXP.

In 3.1 WinXP is required so remove checks and code for prior versions.

src/common/filefn.cpp

@@ -1679,15 +1679,6 @@ static bool wxCheckWin32Permission(const wxString& path, DWORD access)
         return false;
     }
 
-    if ( wxGetOsVersion() == wxOS_WINDOWS_9X )
-    {
-        // FAT directories always allow all access, even if they have the
-        // readonly flag set, and FAT files can only be read-only
-        return (dwAttr & FILE_ATTRIBUTE_DIRECTORY) ||
-                    (access != GENERIC_WRITE ||
-                        !(dwAttr & FILE_ATTRIBUTE_READONLY));
-    }
-
     HANDLE h = ::CreateFile
                  (
                     path.t_str(),

src/common/filename.cpp

@@ -2606,13 +2606,6 @@ bool wxFileName::SetTimes(const wxDateTime *dtAccess,
     int flags;
     if ( IsDir() )
     {
-        if ( wxGetOsVersion() == wxOS_WINDOWS_9X )
-        {
-            wxLogError(_("Setting directory access times is not supported "
-                         "under this OS version"));
-            return false;
-        }
-
         path = GetPath();
         flags = FILE_FLAG_BACKUP_SEMANTICS;
     }

src/msw/pen.cpp

@@ -300,19 +300,6 @@ bool wxPenRefData::Alloc()
    const COLORREF col = m_colour.GetPixel();
 
 #ifdef wxHAVE_EXT_CREATE_PEN
-   // Only NT can display dashed or dotted lines with width > 1
-   static const int os = wxGetOsVersion();
-   if ( os != wxOS_WINDOWS_NT &&
-           (m_style == wxPENSTYLE_DOT ||
-            m_style == wxPENSTYLE_LONG_DASH ||
-            m_style == wxPENSTYLE_SHORT_DASH ||
-            m_style == wxPENSTYLE_DOT_DASH ||
-            m_style == wxPENSTYLE_USER_DASH) &&
-            m_width > 1 )
-   {
-       m_width = 1;
-   }
-
    // check if it's a standard kind of pen which can be created with just
    // CreatePen()
    if ( m_join == wxJOIN_ROUND &&

src/msw/toplevel.cpp

@@ -1341,15 +1341,7 @@ bool wxTopLevelWindowMSW::SetTransparent(wxByte alpha)
 
 bool wxTopLevelWindowMSW::CanSetTransparent()
 {
-    // The API is available on win2k and above
-
-    static int os_type = -1;
-    static int ver_major = -1;
-
-    if (os_type == -1)
-        os_type = ::wxGetOsVersion(&ver_major);
-
-    return (os_type == wxOS_WINDOWS_NT && ver_major >= 5);
+    return true;
 }
 
 void wxTopLevelWindowMSW::DoFreeze()

src/msw/utils.cpp

@@ -891,8 +891,6 @@ bool wxShutdown(int WXUNUSED_IN_WINCE(flags))
 #else
     bool bOK = true;
 
-    if ( wxGetOsVersion(NULL, NULL) == wxOS_WINDOWS_NT ) // if is NT or 2K
-    {
     // Get a token for this process.
     HANDLE hToken;
     bOK = ::OpenProcessToken(GetCurrentProcess(),
@@ -921,7 +919,6 @@ bool wxShutdown(int WXUNUSED_IN_WINCE(flags))
 
         ::CloseHandle(hToken);
     }
-    }
 
     if ( bOK )
     {

src/msw/utilsexc.cpp

@@ -761,8 +761,7 @@ long wxExecute(const wxString& cmd, int flags, wxProcess *handler,
     DWORD dwFlags = CREATE_SUSPENDED;
 
 #ifndef __WXWINCE__
-    if ( (flags & wxEXEC_MAKE_GROUP_LEADER) &&
-            (wxGetOsVersion() == wxOS_WINDOWS_NT) )
+    if ( (flags & wxEXEC_MAKE_GROUP_LEADER) )
         dwFlags |= CREATE_NEW_PROCESS_GROUP;
 
     dwFlags |= CREATE_DEFAULT_ERROR_MODE ;

src/msw/window.cpp

@@ -916,24 +916,11 @@ void wxWindowMSW::WarpPointer(int x, int y)
 }
 
 void wxWindowMSW::MSWUpdateUIState(int action, int state)
-{
-    // WM_CHANGEUISTATE only appeared in Windows 2000 so it can do us no good
-    // to use it on older systems -- and could possibly do some harm
-    static int s_needToUpdate = -1;
-    if ( s_needToUpdate == -1 )
-    {
-        int verMaj, verMin;
-        s_needToUpdate = wxGetOsVersion(&verMaj, &verMin) == wxOS_WINDOWS_NT &&
-                            verMaj >= 5;
-    }
-
-    if ( s_needToUpdate )
 {
     // we send WM_CHANGEUISTATE so if nothing needs changing then the system
     // won't send WM_UPDATEUISTATE
     ::SendMessage(GetHwnd(), WM_CHANGEUISTATE, MAKEWPARAM(action, state), 0);
 }
-}
 
 // ---------------------------------------------------------------------------
 // scrolling stuff