Hi,

I'm using Wix version 3.0.5419.0.

The project I'm working on is a fairly plain single featured installer. 
The bulk of the installer is made up of several large (30MB+) zip files. 
I've found that the patches between versions end up very large as a 
result, and have determined that the zip files are not being delta'd (by 
inspecting the MSPs with Orca). Experiments showed that reducing the 
size of the zips to around 25MB and below dramatically decreased the 
size of the overall patch (from approx 50MB in total with large zip 
files that aren't delta'd, to <2MB with correct deltas). This problem is 
made worse when targetting multiple versions as the patches scale 
linearly with the number of versions - a three version patch is bigger 
than the original installer! We would prefer not to hide this problem by 
reducing the sizes of the zips, as (a) the problem could return and (b) 
there would be a significant amount of work involved in reworking the 
way the application understands its data.

Is there a known problem with Pyro and delta patching? Is it likely to 
be a problem with Windows Installer rather than Wix?

Any help would be much appreciated.

Steve Allen

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