hey MDGx. check out the WTL app for creating and patching files at this site:
http://www.codeproject.com/tools/patch.aspthis tool uses the MSPATCHA.DLL file to "patch" existing files (like what the IEUPDATE.EXE file does to those DLL files in IE updates like KB912812, KB905915. etc.). you'll have to login to the CodeProject site to download the WTL patcher. it can also use the MSPATCHC.DLL file to create patches.
IEUPDATE.EXE uses the info from the "_SFX_MANIFEST_" file inside recent IE updates to "patch" many of the DLL files.
Contents of the "_SFX_MANIFEST_" file from IE update KB912812:
--------
[Deltas]
"RTMQFE\browseui.dll" = "browseui.dll._p", browseui.dll
"RTMQFE\cdfview.dll" = "cdfview.dll._p", cdfview.dll
"RTMQFE\danim.dll" = "danim.dll._p", danim.dll
"RTMQFE\dxtrans.dll" = "dxtrans.dll._p", dxtrans.dll
"RTMQFE\iepeers.dll" = "iepeers.dll._p", iepeers.dll
"RTMQFE\inseng.dll" = "inseng.dll._p", inseng.dll
"RTMQFE\mshtml.dll" = "mshtml.dll._p", mshtml.dll
"RTMQFE\msrating.dll" = "msrating.dll._p", msrating.dll
"RTMQFE\mstime.dll" = "mstime.dll._p", mstime.dll
"RTMQFE\pngfilt.dll" = "pngfilt.dll._p", pngfilt.dll
"RTMQFE\shdocvw.dll" = "shdocvw.dll._p", shdocvw.dll
"RTMQFE\shlwapi.dll" = "shlwapi.dll._p", shlwapi.dll
"RTMQFE\urlmon.dll" = "urlmon.dll._p", urlmon.dll
"RTMQFE\wininet.dll" = "wininet.dll._p", wininet.dll
[Verify]
"RTMQFE\browseui.dll" = 4CCEFD261EB9C0481F3EADB60305A07F
"RTMQFE\cdfview.dll" = 6F6648E2197EDA21C1D2CF1D6887D9F2
"RTMQFE\danim.dll" = CC6F690887A37362C21326D332F48AA7
"RTMQFE\dxtrans.dll" = A4D8D11EEEFC1A89CCF7FA5698C27B85
"RTMQFE\iepeers.dll" = 7D7AA31981F6770C7323C713869CC49E
"RTMQFE\inseng.dll" = AA1E2E594CF861D1200100C9988E5332
"RTMQFE\mshtml.dll" = D2C040629DC44C110897009366CB93B0
"RTMQFE\msrating.dll" = F02EB202619E20B537331EEC54FB30C2
"RTMQFE\mstime.dll" = E31099347F200693B4A8A1F81BF9ECE8
"RTMQFE\pngfilt.dll" = 4DB34F3C29CFD1DF1F92FCD9C8DDB755
"RTMQFE\shdocvw.dll" = A79348B75DA190EC91E2BA5CCF5C25BE
"RTMQFE\shlwapi.dll" = D311A7FC4E081EE7AAAA6F581CF3C471
"RTMQFE\urlmon.dll" = 9C40366FD9BE7965408C51C102E18879
"RTMQFE\wininet.dll" = AAA8906281E95954A20DF24BFC288FDE
[Delete]
"*._p"
--------
also bundled inside recent IE updates are files with extension "._p" < those are patch files. IEUPDATE along with the MSPATCHA.DLL file patches the original DLL files (those are the RTMGDR editions) with the "._p" files, thus turning them into the RTMQFE editions of the DLL files.