To help avoid "prompts for source" in patch-on-patch scenarios Windows 
Installer has been known to cache "originals" of files that are patched, but 
that behavior can be turned off. Maybe it is off for uncompressed sources?
 
> Date: Wed, 8 Jan 2014 13:40:48 -0800
> From: dtkob...@gmail.com
> To: WiX-users@lists.sourceforge.net
> Subject: Re: [WiX-users] Patching compressed VS uncompressed image?
> 
> My patches are whole file patches.
> 
> There is no UI either in the patches either.
> 
> I'll have to check out the hash table and see what files may mismatch.  It
> never mentions anything about the file it's trying to access, it just keeps
> mentioning the product it looking for.  About every 45 seconds the time out
> happens and starts the query again.  It just goes on and on and on until it
> decides to apply the patch.
> 
> There are uninstallable patches as well.
> 
> I would assume a compressed and uncompressed would behave the same.  I get
> why an uncompressed install might be different in that the files get
> unpacked in a temp directory for install which the uninstall doesn't need
> to do.  The non stop attempt to access source is what bugs me.  If you
> install from an administrative installation which is uncompressed and then
> apply my patch 1 and patch 2, I don't get this issue.  I now the MSI is
> marked as administrative installation and it has a reference to the
> external cab file, but what would make them behave different?  Are those
> entries enough to make it act this way?
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