I did something like this for one of my customers.  He had value added 
resellers that would inject custom files and metadata / rebranding it.  The end 
user sysadmins would then make additional tweaks before distributing across the 
enterprise.   Each layer  could then "seal" certain attributes so that the next 
person transforming the installer had less choices.

He wrote the UI wizard and I wrote the "InstallTransformer" class library.  It 
was kind of fun and I could be convinced to share snippets for the who need it.

----------------------------------------
 From: "Bas Graaf" <bas.gr...@microsoft.com>
Sent: Friday, November 01, 2013 5:27 PM
To: "General discussion about the WiX toolset." 
<wix-users@lists.sourceforge.net>
Subject: Re: [WiX-users] Adding files to msi

Yes, we considered giving them our source also. However, we'd like to keep it 
as simple as possible (for them). Typically, they would not know anything about 
WiX or Windows Installer internals and our WiX source is quite complicated. 
Although the wixlib suggestion would at least not expose them to that. I'll 
include it in my investigations. Thanks for the suggestion.

_Bas

-----Original Message-----
From: Nicolás Alvarez [mailto:nicolas.alva...@gmail.com] 
Sent: 1. november 2013 23:07
To: General discussion about the WiX toolset.
Subject: Re: [WiX-users] Adding files to msi

2013/11/1 Bas Graaf <bas.gr...@microsoft.com>:
> Hi,
>
> I'd like to enable our partners to simply add a few files to our installer 
> package (an msi) before they deliver it to their customers (e.g., to add 
> third-party plugins, certificates, and various other configuration files).  
> So far, I've been prototyping a simple tool based on DTF to add relevant 
> records to the msi database. This seems to work fine. All that is left is to 
> add the actual file(s) to the embedded cab. I tried 
> InstallPackage.UpdateFiles, but this only seems to update files that were in 
> the cab before.
>
> Next idea is to  get the cab from the _Streams table, add files, and put it 
> back. Just wanted to check here if there is anything in DTF (or elsewhere) 
> that already implements such a scenario.

That sounds quite nasty. Why don't you give them your WiX source for them to 
modify and rebuild, or a wixlib they can include in their own package?

--
Nicolás

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