partitioning - Windows 7 sees all Ubuntu partitions as primary

I got a new laptop with Windows 7. I resized the windows partition and installed Ubuntu 10.10 in the free space using manual partition, with several partitions for /boot, /, /home, swap, and another to be formated as NTFS to share files with the Windows 7 boot.

All worked perfectly on the Ubuntu side, but the disk management of Windows 7 sees all partitions as Primary and doesn't let me format the one I set aside for NTFS. I always thought that there could only be 4 primary partitions, so seeing 9 primary partions was unexpected. With all my previous computers this worked fine and I could use both systems to access the common data partition.

Windows 7 Disk Management:

How can I format this partition to NTFS?

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Edit: This is the output of fdisk -l

Disco /dev/sda: 320.1 GB, 320072933376 bytes
255 cabezas, 63 sectores/pista, 38913 cilindros
Unidades = cilindros de 16065 * 512 = 8225280 bytes
Tamaño de sector (lógico / físico): 512 bytes / 512 bytes
Tamaño E/S (mínimo/óptimo): 512 bytes / 512 bytes
Identificador de disco: 0x949ef5d2
Dispositivo Inicio    Comienzo      Fin      Bloques  Id  Sistema
/dev/sda1               1           5       40131   de  Utilidad Dell
/dev/sda2   *           6        1918    15360000    7  HPFS/NTFS
/dev/sda3            1918        8258    50931829+   7  HPFS/NTFS
/dev/sda4            8259       38914   246238209    5  Extendida
/dev/sda5            8259        8271       97280   83  Linux
/dev/sda6           36969       38914    15624192   82  Linux swap / Solaris
/dev/sda7            8271       14350    48827392   83  Linux
/dev/sda8           14350       16781    19529728   83  Linux
/dev/sda9           33321       36969    29296640   83  Linux
/dev/sda10          16781       33320   132852736   83  Linux
Las entradas de la tabla de particiones no están en el orden del disco

The partition 10 that I wanted to be NTFS appeared as of Linux type, even when in the installer i didn't select that. I tried changing that to NTFS with the Disk Utility and it stalled changing it. Installed GParted but every time I run it, it crashes with

glibmm-ERROR **:
unhandled exception (type std::exception) in signal handler:
what: basic_string::_S_create

Finally changed the type with fdisk to 0x07. The output of fdisk changed only in this line

/dev/sda10          16781       33320   132852736    7  HPFS/NTFS

Now Windows 7 shows this partition and only this partition as being inside an extended partition. Is there a way to validate my partition table as correct?

You can format the NTFS partition in Linux, if this will work on the windows side i don't know. But this command should be able to format the disk correctly:

sudo mkntfs -L "LABEL" /dev/NTFS-DISK

Where NTFS-DISK should be replaced by the right partiotion and LABEL replaced by a filsystem label of your choosing, you have to have the ntfsprogs package installed. Afaik you should then be able to (if you are a superuser/administrator) assign the partition a drive letter in Windows after formatting it.