Can InnoSetup execute a program before the uninstallation starts? My program creates some registry values. I have an executable that can remove those registry values and my question is, can InnoSetup run that executable before the uninstallation starts?
See the documentation on Setup Script Sections, particularly the UninstallRun one at the bottom of the tree:
[UninstallRun]
Filename: "{app}\INIT.EXE"; Parameters: "/x"
If you need to do something more complex, you can also do it in code using the Pascal scripting functionality in InnoSetup. See UninstallCodeExample1.iss' in theInnoSetup 5\Examples` folder.
来源：https://stackoverflow.com/questions/14023790/how-to-execute-program-before-the-uninstallation-starts