I don't have access to a real Windows XP machine at the moment, but this fails for me with l3codecx.ax from winetricks:
``` leslie@terabithia:~/git/wine32/dlls/quartz/tests$ make -j8 && WINEDEBUG=-all WINETEST_PLATFORM=windows WINEDLLOVERRIDES=l3codecx.ax=n wine i386-windows/quartz_test.exe mpeglayer3 make[1]: Entering directory '/home/leslie/git/wine32' make[1]: Nothing to be done for 'dlls/quartz/tests/all'. make[1]: Leaving directory '/home/leslie/git/wine32' mpeglayer3.c:922: Test failed: Got 16 buffers. mpeglayer3.c:923: Test failed: Got size 2222. mpeglayer3.c:962: Test failed: Got 16 buffers. mpeglayer3.c:963: Test failed: Got size 2222. 0020:mpeglayer3: 257 tests executed (0 marked as todo, 0 as flaky, 4 failures), 0 skipped. ```