どうでもいい話ですが...Windows 10 の配信方式がー微かにーBlackBerry 10 OS(debrick OS ファイル)の配布方式に似ているような気がします。BBUGJP の趣旨から100%逸脱しますが、念のため、書き留めます。
(Pro - x64 - build 10240)をダウンロードします。(Windows 7 / 8 / 8.1 / 10 からのアップグレード時には C:\$Windows.~BT\Sources\Install.esd に保存されます。)
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C:\esd-decrypter> decrypt.cmd
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1 - Create ISO with Standard install.wim
2 - Create ISO with Compressed install.esd
3 - Create Standard install.wim
4 - Create Compressed install.esd
5 - ESD file info
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Choose a menu option, or 0 to quit: 1
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Running Decryption program...
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Creating Setup Media Layout...
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Applying image 1 ("Windows Setup Media") from "C:\esd-decrypter\10240.16384.150709-1700.th1_clientpro_ret_x64fre_ja-jp_e7eaaa2dba8c07c87b8e11a29cd56dbc4fb144fe.esd" to directory "ISOFOLDER\"
Extracting file data: 244 MiB of 244 MiB (100%) done
Done applying WIM image.
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Creating boot.wim file...
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Writing LZX-compressed data using 2 threads
678 MiB of 678 MiB (uncompressed) written (100% done)
Writing LZX-compressed data using 2 threads
128 MiB of 128 MiB (uncompressed) written (100% done)
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Creating install.wim file...
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Writing LZX-compressed data using 2 threads
7001 MiB of 7001 MiB (uncompressed) written (100% done)
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Creating ISO file...
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CDIMAGE 2.53m CD-ROM and DVD-ROM Premastering Utility
Copyright (C) Microsoft, 1993-2007. All rights reserved.
For Microsoft internal use only.
Scanning source tree (500 files in 14 directories)
Scanning source tree complete (962 files in 101 directories)
Computing directory information complete
Image file is
4063166464 bytes (before optimization)
Writing 962 files in 101 directories to ja_windows_10_pro_10240_x64_dvd.iso
100% complete
Storage optimization saved 24 files, 13879296 bytes (1% of image)
After optimization, image file is 4051501056 bytes
Space saved because of embedding, sparseness or optimization = 13879296
Done.
Press any key to exit.
C:\esd-decrypter> dir
Directory of C:\esd-decrypter
2015/07/27 21:55 2,827,079,812 10240.16384.150709-1700.th1_clientpro_ret_x64fre_ja-jp_e7eaaa2dba8c07c87b8e11a29cd56dbc4fb144fe.esd
2015/07/27 22:16 4,051,501,056 ja_windows_10_pro_10240_x64_dvd.iso
2015/07/16 05:37 21,888 decrypt.cmd
2015/07/16 05:37 2,499 ReadMe.txt
2015/07/27 21:44 <DIR> bin