[How integrate Language pack in Windows 7 RC English]

hi,

i tried to integrate german language to build 7229 x64, process was successfull but installation stops after expanding files to hdd with the error:

Offline localization failed .... (in german: Offline Gebietsschema ....)

i couldnt mount the install.wim with image index 4:

Mount Path:	D:\7Work\Mount
Image File:	D:\7Work\DVD\sources\install.wim
Image Index:	4
Mounted R/W:	1

Opening WIM...please wait...

ERROR: Unable to mount image.
ERROR: ???

iso name: 7229.0.090604-1901_x64fre_client_en-us_OEM_Ultimate-GRMCULXFREO_EN_DVD.iso

any ideas??