Installshield 3 32bit Generic Installer Best ((top)) -

[Files] Source: "MyApp.exe"; DestDir: "app" Source: "*.dll"; DestDir: "app"

You on 64-bit host. Instead:

: It is specifically designed for installers that include the file _inst32i.ex_ or have a version string starting with 3.xx.xxx.x . Significance in Preservation installshield 3 32bit generic installer best

Do run SETUP.EXE directly. Instead, extract manually: [Files] Source: "MyApp