ReactOS doesn't mount logical units in extended partitions.

I try to provide a second filesystem for (trying) instaling Python under resactos:

quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu# mkdosfs -C essai.hd 50000
mkdosfs 2.11 (12 Mar 2005)
quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu# rm -Rf mnt_essai/
quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu# mkdir mnt_essai
quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu# mount -o loop essai.hd mnt_essai/
quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu# cp -v ../../[pP]ython-2.* mnt_essai/
`../../Python-2.1.3.exe' -> `mnt_essai/Python-2.1.3.exe'
`../../Python-2.2.3.exe' -> `mnt_essai/Python-2.2.3.exe'
`../../python-2.4.4.msi' -> `mnt_essai/python-2.4.4.msi'
`../../python-2.5.1.msi' -> `mnt_essai/python-2.5.1.msi'
quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu# umount mnt_essai/
quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu# chmod 777 essai.hd
quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu# qemu-img convert -f raw essai.hd -O vmdk essai.vmdk
quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu# chmod 777 essai.vmdk
quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu# ls -l
total 150300
rw-rr- 1 jmg jmg 131072 2007-02-07 14:28 bios.bin
rw-rr- 1 jmg jmg 45 2007-06-11 16:24 boot.bat
rw-rr- 1 jmg jmg 99 2007-08-12 12:01 boot.sh
rw-rr- 1 jmg jmg 107 2007-08-12 11:58 boot.sh~
-rwxrwxrwx 1 root root 51200000 2007-08-12 13:23 essai.hd
-rwxrwxrwx 1 root root 34603008 2007-08-12 13:25 essai.vmdk
rw-rr- 1 jmg jmg 162816 2007-02-07 14:28 fmod.dll
drwxr-xr-x 2 jmg jmg 4096 2007-08-12 11:56 keymaps
rw-rr- 1 jmg jmg 42496 2007-02-07 14:28 libusb0.dll
drwxr-xr-x 2 jmg jmg 4096 2007-08-12 11:56 License
drwxr-xr-x 2 root root 4096 2007-08-12 13:24 mnt_essai
rw-rr- 1 jmg jmg 32768 2007-02-07 14:28 pxe-ne2k_pci.bin
rw-rr- 1 jmg jmg 32768 2007-02-07 14:28 pxe-pcnet.bin
rw-rr- 1 jmg jmg 32768 2007-02-07 14:28 pxe-rtl8139.bin
rw-rr- 1 jmg jmg 1396565 2007-02-07 14:28 qemu.exe
rw-rr- 1 jmg jmg 218113 2007-02-07 14:28 qemu-img.exe
rw-rr- 1 jmg jmg 82116608 2007-08-12 13:27 ReactOS.vmdk
rw-rr- 1 jmg jmg 2016 2007-06-11 16:42 Readme.txt
rw-rr- 1 jmg jmg 486909 2007-02-07 14:28 SDL.dll
rw-rr- 1 jmg jmg 37888 2007-02-07 14:28 vgabios.bin
rw-rr- 1 jmg jmg 35328 2007-02-07 14:28 vgabios-cirrus.bin
quijote:/home/jmg/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu#

jmg@quijote:~/Desktop/reactos_qemu/ReactOS-0.3.3-RC1-qemu$ qemu -net nic -m 128 -hda ReactOS.vmdk -hdb essai.vmdk
Could not open '/dev/kqemu' - QEMU acceleration layer not activated

When navigating in ReactOS (both explorer and cmd), disk D: is detected but unavailable; reported as 0 bytes used and 0 bytes free by explorer.