[wix-users] bundle installer is too big

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Hello. I'm wondering if anybody noticed that Burn engine embedded into bundle exe file inflates it to almost 300MB. My 3 MSI installers that I put in there are 5 times smaller in size (in total). I'm using WixStandardBootstrapperApplication and in <Chain> directive have 3 MSIs, and apart from them I only have a couple of small images, one for background, one for icon. Is it a known issue/bug? I tried to search but couldn't find anything. This creates a bit of a problem for us because such a big installer is going to take a lot of space in our Continuous Integration build system.