What about setup.exe and .msi

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I use WebSetup project to create the deployment file for my web application.
The WebSetup project always create two file xxxx.msi and setup.exe.
What is the difference between?

 

[Eliyahu Goldin]

xxxx.msi is a database of installation items. setup.exe is an utility that
starts installation. You don't have to use it, double-clicking xxxx.msi will
cause the same effect. The actual installation is performed by the Windows
Installer Service.

Eliyahu

 

[Peter Rilling]

In addition, the setup.exe also checks to make sure you have the correct
environment such as correct .NET version and such. It will tell you if you
do not.

 

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Thanks, Could we include the xxx.msi in setup.exe?