user32: Specify the full application path when starting builtin apps.

dlls/user32/user_main.c

@@ -354,12 +354,14 @@ BOOL WINAPI ExitWindowsEx( UINT flags, DWORD reason )
     static const WCHAR forceW[]       = { ' ','-','-','f','o','r','c','e',0 };
     static const WCHAR shutdownW[]    = { ' ','-','-','s','h','u','t','d','o','w','n',0 };
 
+    WCHAR app[MAX_PATH];
     WCHAR cmdline[MAX_PATH + 64];
     PROCESS_INFORMATION pi;
     STARTUPINFOW si;
 
-    GetSystemDirectoryW( cmdline, MAX_PATH );
-    lstrcatW( cmdline, winebootW );
+    GetSystemDirectoryW( app, MAX_PATH - sizeof(winebootW)/sizeof(WCHAR) );
+    strcatW( app, winebootW );
+    strcpyW( cmdline, app );
 
     if (flags & EWX_FORCE) lstrcatW( cmdline, killW );
     else
@@ -371,7 +373,7 @@ BOOL WINAPI ExitWindowsEx( UINT flags, DWORD reason )
 
     memset( &si, 0, sizeof si );
     si.cb = sizeof si;
-    if (!CreateProcessW( NULL, cmdline, NULL, NULL, FALSE, DETACHED_PROCESS, NULL, NULL, &si, &pi ))
+    if (!CreateProcessW( app, cmdline, NULL, NULL, FALSE, DETACHED_PROCESS, NULL, NULL, &si, &pi ))
     {
         ERR( "Failed to run %s\n", debugstr_w(cmdline) );
         return FALSE;

dlls/user32/win.c

@@ -1852,11 +1852,13 @@ HWND WINAPI GetDesktopWindow(void)
         if (!GetUserObjectInformationW( GetProcessWindowStation(), UOI_FLAGS, &flags,
                                         sizeof(flags), NULL ) || (flags.dwFlags & WSF_VISIBLE))
         {
-            static const WCHAR command_line[] = {'\\','e','x','p','l','o','r','e','r','.','e','x','e',' ','/','d','e','s','k','t','o','p',0};
+            static const WCHAR explorer[] = {'\\','e','x','p','l','o','r','e','r','.','e','x','e',0};
+            static const WCHAR args[] = {' ','/','d','e','s','k','t','o','p',0};
             STARTUPINFOW si;
             PROCESS_INFORMATION pi;
-            WCHAR systemdir[MAX_PATH];
-            WCHAR cmdline[MAX_PATH + sizeof(command_line)/sizeof(WCHAR)];
+            WCHAR windir[MAX_PATH];
+            WCHAR app[MAX_PATH + sizeof(explorer)/sizeof(WCHAR)];
+            WCHAR cmdline[MAX_PATH + (sizeof(explorer) + sizeof(args))/sizeof(WCHAR)];
 
             memset( &si, 0, sizeof(si) );
             si.cb = sizeof(si);
@@ -1865,11 +1867,13 @@ HWND WINAPI GetDesktopWindow(void)
             si.hStdOutput = 0;
             si.hStdError  = GetStdHandle( STD_ERROR_HANDLE );
 
-            GetSystemDirectoryW( systemdir, MAX_PATH );
-            lstrcpyW( cmdline, systemdir );
-            lstrcatW( cmdline, command_line );
-            if (CreateProcessW( NULL, cmdline, NULL, NULL, FALSE, DETACHED_PROCESS,
-                                NULL, systemdir, &si, &pi ))
+            GetWindowsDirectoryW( windir, MAX_PATH );
+            strcpyW( app, windir );
+            strcatW( app, explorer );
+            strcpyW( cmdline, app );
+            strcatW( cmdline, args );
+            if (CreateProcessW( app, cmdline, NULL, NULL, FALSE, DETACHED_PROCESS,
+                                NULL, windir, &si, &pi ))
             {
                 TRACE( "started explorer pid %04x tid %04x\n", pi.dwProcessId, pi.dwThreadId );
                 WaitForInputIdle( pi.hProcess, 10000 );