“This program might not have installed correctly”

Question

I am aware of both this and this questions.

Which unfortunately didn\'t quite answer what I\'d like to know:

1. The answers in the above questions sugg

Answer 1

See Installer Detection, it lists what is checked to decide whether an executable is an installer.

"This program might not have..." is a product of "Program Compatibility Assitant", and is documented in the Application Compatibility: Program Compatibility Assistant (PCA) topic. According to the document the reinstall option applies XPSP2 compatibility mode.