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I am working with custom module upgrade script. I know Once Magento runs an installer script for a module, it will never run another installer for that module again. I checked core "Cms" module I found two installer script mysql4-install-0.7.0.php and install-1.6.0.0.php. why two installer files? which will run or both will run? in which sequence they will run?

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It depends on what version you install the module.
In the CMS case (or any other module in the core) the file mysql4-install-0.7.0.php existed in versions prior to 1.6.
If you install Magento 1.5 for example mysql4-install-0.7.0.php will be exectuted (and there was no install-1.6.0.0.php in 1.5)..

If you install version 1.6 or later the install-1.6.0.0.php will be executed.

See this question and answer to understand how install and upgrade scripts are executed: What is the order of execution of setup scripts in a module?

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