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About ISS Files
An .iss file is a script that describes how to create a Windows software installer using Inno Setup. It contains instructions for packaging an application, including which files to install, where to place them, and which shortcuts, settings, or other installation tasks to create. The script acts as a set of directions that Inno Setup follows to produce a Windows installer program.
Inno Setup was first released in the late 1990s as a tool for creating Windows installation packages. Software developers use ISS files to prepare installers for distributing applications, updates, and related files to users. The scripts can also specify tasks such as creating Start menu shortcuts, updating Windows Registry entries, and configuring uninstall options.
You can open and edit an .iss file with a source code editor or plain text editor, since the file stores readable text. You can also open and edit an .iss file with the Inno Setup Compiler, which compiles the script into a Windows installer.
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