X3DAudio1_7.dll and XAPOFX1_5.dll for gaming in Wine

I'm trying to play XCOM on Wine (using Play on Linux). Unfortunately, this doesn't work.

The debug option in POL outputs this:

Running wine-1.5.15 play-XCOM.exe (Working directory : /home/stephen/.PlayOnLinux/wineprefix/XCOM/drive_c/XCom Enemy Unknown)
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: cannot open shared object file: No such file or directoryfixme:shell:SHAutoComplete stub
fixme:exec:SHELL_execute flags ignored: 0x00000180
err:module:import_dll Loading library X3DAudio1_7.dll (which is needed by L"C:\\XCom Enemy Unknown\\Binaries\\Win32\\XComGame.exe") failed (error c000007b).
err:module:import_dll Loading library XAPOFX1_5.dll (which is needed by L"C:\\XCom Enemy Unknown\\Binaries\\Win32\\XComGame.exe") failed (error c000007b).
err:module:LdrInitializeThunk Main exe initialization for L"C:\\XCom Enemy Unknown\\Binaries\\Win32\\XComGame.exe" failed, status c0000135

This leads me to believe that Wine is missing X3DAudio1_7.dll and XAPOFX1_5.dll. I transfered these files from my Windows install into

/home/stephen/.PlayOnLinux/wineprefix/XCOM/drive_c/windows/system32

but it still gives me the same error. What can I do? I tried using Wine overrides but that didn't seem to help either.

I'm running Xubuntu 12.04, XCOM is running in wine 1.5.15

I've fixed the error by installing the dxfullsetup and d3dx11 packages.