Were you able to supply mspatchc with the symbols file (*.pdb) for the
binary? It is documented to be able to better compress files when the PDB is
supplied. I don't know what definition of better they mean, but you could
try it both ways (with and without the PDBs).

Unfortunately Windows Installer uses mspatcha to apply the delta to the
file(s), and that doesn't appear to be overridable. If you can find a
replacement for mspatchc that doesn't fail with the large files that
produces output compatible with mspatcha (assuming mspatcha can deal with
files that big), I can help you with the binder extension you would need to
build your delta patches.

Also mspatchc/mspatcha come from Windows (mspatchc in the SDK and mspatcha
in Windows itself). You could try changing the mspatchc/mspatcha versions to
see if the windows build/sdk they come from make any difference.

-----Original Message-----
From: Darren Grant [mailto:therealklu...@gmail.com] 
Sent: Monday, November 23, 2009 1:25 PM
To: wix-users@lists.sourceforge.net
Subject: [WiX-users] Delta patching a very large binary file.

Hi,

I am new to WiX and MSI programming in general, coming from an
imperative NSIS background where I used vpatch to apply delta patches
to large (> 500-MB) binary files.

Deferring to the experts out there, how do you achieve this with WiX?
:)  Unfortunately the files are too large for mspatchc and it just
creates a replacement instead of a delta after almost a couple hours
of processing.


Thank you!

--Darren

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