Step 1 - I modified the entries_imgburn.ini and imgburn.inf like the example found in this video
Step 2 - Created CAB using DX Tools
Step 3 - Added to WinNT6.x True Integrator (Ignore-Ceck). The AddOn appears in the list at the bootom.
OK (but in this case regard Step 3 - if you choose Check-State you will see that the WinNT6.x True Integrator do not added the AddOn in the list)
Setp 4 - Click Apply -- DISM appears to sucessfuly compete the operation
2012-10-22 01:56:07 : Processing 2 of 2 - Adding package ImgBurn~~True AddOn~Multilanguage~2.5.7.0~Copyright © 2005 - 2012 LIGHTNING UK!~OnePiece~http://www.imgburn.com/ - C:\Users\Bryan\Desktop\System Builder\Addon CABS\ImgBurn_v2.5.7_INTL_TRUE_ADDON.cab
2012-10-22 01:56:09 : The operation was successful.
However, the addon does not appear in the upper section 'Optional Component List'. Also the addon does not appear in the mounted image.
No
2012-10-23 02:05:46 : Mounting image - 1~Microsoft Windows PE (x64)~Microsoft Windows PE (x64)~1,188,599,952 bytes~x64~<undefined>~6.2.9200~16384~0~WindowsPE~WindowsPE~WinNT~~WINDOWS~2964~13133~7/26/2012 - 8:39:55 AM~10/9/2012 - 5:30:29 PM~en-US (Default)~D:\HRM_CCSA_X64FRE_EN-US_DV5\sources\boot.wim~D:\MountDir_TMP
2012-10-23 02:06:22 : The operation was successful.
2012-10-23 02:08:10 : Adding package ImgBurn
2012-10-23 02:08:10 : Processing 1 of 1 - Adding package ImgBurn~~~Multilanguage~2.5.7.0~~~http://www.imgburn.com/ - C:\Users\OnePiece\Desktop\Ricks_ImgBurn2.5.7_Intl_addon.cab
2012-10-23 02:08:14 : ERROR: Error: ImgBurn.inf - ImgBurn.exe not found.
@Error - I think you tried to Install\Integrate the AddOn in Windows x64 (DX WinNT6.x True Integrator rightly does not Install\Integrate the AddOn, because the AddOn indicates to install only Windows x32/x86 32 bit)
[sourceDisksNames.x86]1="Windows CD/DVD-Rom","ImgBurn.cab",,"i386"
AddOn tells them to find those files only in systems 32 bit INF SourceDisksNames Section
if you want to integrate the AddOn also on x64, also need to change this line so (and very important always need to ask the Creator of the AddOn if its AddOn can also be installed in Windows x32 or x64 ect ect)
[sourceDisksNames]1="Windows CD/DVD-Rom","ImgBurn.cab",,"i386"
Ciao.