По ходу надо ковырять Setup.exe и его зависимые компоненты. Потому как WinPE 7 и WinPE 10 вызывают в процессе установки при нажатии кнопки "Установить" Setup.exe с одинаковыми параметрами.
Вот лог WinPE 7.0
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2015-09-21 00:10:05, Info UI Determining if we are in WDS/Unattend mode
Input Install: Not a PS2 device.
2015-09-21 00:10:12, Info UI No need to hide autorun
2015-09-21 00:10:12, Info [0x0a000a] UI Autorun:Autorun core successfully initialized!!!
2015-09-21 00:10:12, Info [0x0a000b] UI Autorun:Autorun UI successfully initialized!!!
2015-09-21 00:10:12, Info UI AppWindow has layout style 0
2015-09-21 00:10:12, Info UI NavWindow has layout style 0
2015-09-21 00:10:12, Info [0x0a011c] UI WizardDialogPost::SetActive
2015-09-21 00:10:13, Info [0x0a018b] UI User selected the language ru-RU for installation.
2015-09-21 00:10:13, Info [0x0a0190] UI User has selected the locale as ru-RU.
2015-09-21 00:10:13, Info [0x0a0191] UI User has selected the keyboard type as 0419:00000419.
2015-09-21 00:10:13, Info [0x0a0134] UI Accepting Next. Exiting Page Установка Windows.
2015-09-21 00:10:13, Info UI Entering Page Установка Windows.
2015-09-21 00:10:13, Info [0x0a011c] UI WizardDialogPost::SetActive
2015-09-21 00:10:14, Info [0x0a018e] UI Passing command line parameter ("
X:\Sources\setup.exe /HideWelcome /uilanguage:ru-RU /targetlanguage:ru-RU /Targetinputlocale:0419:00000419 /Targetuserlocale:ru-RU /HideOOBELangPage:TRUE") to IBS.
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Вот лог WinPE 10
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2015-09-21 00:37:18, Info UI Determining whether we should run ConX or legacy setup
2015-09-21 00:37:18, Info UI Running WinPE. Continue to run legacy setup
2015-09-21 00:37:18, Info UI Determining if we are in WDS/Unattend mode
2015-09-21 00:37:19, Info UI No need to hide autorun
2015-09-21 00:37:19, Info [0x0a000a] UI Autorun:Autorun core successfully initialized!!!
2015-09-21 00:37:19, Info [0x0a000b] UI Autorun:Autorun UI successfully initialized!!!
2015-09-21 00:37:19, Info UI AppWindow has layout style 0
2015-09-21 00:37:19, Info UI NavWindow has layout style 0
2015-09-21 00:37:19, Warning [0x0a0180] UI Failed to change the UI language to ru-RU.
2015-09-21 00:37:19, Info UI CLocales::v_EnumLocalesProc - DownlevelGetLocaleInfoEx failed for locale ar-EG. Error: [1009]
2015-09-21 00:37:19, Info UI CLocales::v_EnumLocalesProc - DownlevelGetLocaleInfoEx failed for locale dz-BT. Error: [1009]
2015-09-21 00:37:19, Info [0x0a011c] UI WizardDialogPost::SetActive
2015-09-21 00:37:21, Info [0x0a018b] UI User selected the language ru-RU for installation.
2015-09-21 00:37:21, Info [0x0a0190] UI User has selected the locale as ru-RU.
2015-09-21 00:37:21, Info [0x0a0191] UI User has selected the keyboard type as 0419:00000419.
2015-09-21 00:37:21, Info [0x0a0134] UI Accepting Next. Exiting Page Установка Windows.
2015-09-21 00:37:21, Info UI Entering Page Установка Windows.
2015-09-21 00:37:21, Info [0x0a011c] UI WizardDialogPost::SetActive
2015-09-21 00:37:22, Info [0x0a018e] UI Passing command line parameter ("
X:\Sources\setup.exe /HideWelcome /uilanguage:ru-RU /targetlanguage:ru-RU /Targetinputlocale:0419:00000419 /Targetuserlocale:ru-RU /HideOOBELangPage:TRUE") to IBS.
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*boot.wim оригинальный с multiple edition MSDN - RU, и по ходу в нём есть косяки с ru-RU локализацией, вот индусы.
