reg: Allow either lowercase or uppercase 'x' when used with REG_DWORD.

programs/reg/reg.c

@@ -243,7 +243,7 @@ static LPBYTE get_regdata(LPWSTR data, DWORD reg_type, WCHAR separator, DWORD *r
         {
             LPWSTR rest;
             DWORD val;
-            val = strtoulW(data, &rest, (data[1] == 'x') ? 16 : 10);
+            val = strtoulW(data, &rest, (tolowerW(data[1]) == 'x') ? 16 : 10);
             if (*rest || data[0] == '-') {
                 output_message(STRING_MISSING_INTEGER);
                 break;

programs/reg/tests/reg.c

@@ -298,6 +298,11 @@ static void test_add(void)
     run_reg_exe("reg add HKCU\\" KEY_BASE " /v dword13 /t REG_DWORD /d 00x123 /f", &r);
     ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
 
+    run_reg_exe("reg add HKCU\\" KEY_BASE " /v dword14 /t REG_DWORD /d 0X123 /f", &r);
+    ok(r == REG_EXIT_SUCCESS, "got exit code %d, expected 0\n", r);
+    dword = 0x123;
+    verify_reg(hkey, "dword14", REG_DWORD, &dword, sizeof(dword), 0);
+
     /* REG_DWORD_LITTLE_ENDIAN */
     run_reg_exe("reg add HKCU\\" KEY_BASE " /v DWORD_LE /t REG_DWORD_LITTLE_ENDIAN /d 456 /f", &r);
     ok(r == REG_EXIT_SUCCESS, "got exit code %d, expected 0\n", r);