I have InstallAware installer done as single-file-executable.
Is there any way to extract InstallAware project from it, as a way to continue development
you may use "PackageAware" tool to import any setup into an InstallAware project.
PackageAware is an intelligent wizard that captures the changes a setup makes to a system. You may use PackageAware to monitor the results of any installation, and it will create a ready-to-use installation project that can be immediately built in InstallAware. PackageAware provides a very easy way to migrate legacy installations into Windows Installer, and InstallAware.
You can find more details with the InstallAware documentation.