How to get Inno Setup to unzip a file it installed (all as part of the one installation process)

Question

To save bandwidth/space as well as prevent accidental meddling, the installation files for a database product (call it Ajax), have been zipped up (call that file \"AJAX_Inst

Answer 1

You can use an external command line tool for unzipping your archive, see here for example. Put it in your [Files] section:

[Files]
Source: "UNZIP.EXE"; DestDir: "{tmp}"; Flags: deleteafterinstall

Then call it in your [Run] section, like this:

[Run]
Filename: "{tmp}\UNZIP.EXE"; Parameters: "{tmp}\ZipFile.ZIP -d C:\TargetDir"

(You'll probably want to take your target directory from a script variable, so there is some more work that needs to be done)