; The name of the installer
Name "InstallDirRegKeySample"

; If you don't really need an UAC prompt, for example, you avoid HKLM
RequestExecutionLevel user

; The file to write
; At least in Vista/W7 times, an exename containing "install" may triggered UAC
OutFile "DirRegKeySample.exe"

; The default installation directory
; For first time the installer offers this
InstallDir "$PROGRAMFILES\Defaultpath"

; But if this exists and pass some validations, it will replace it
; Roll your own key name, don't use other's
InstallDirRegKey HKCU "SOFTWARE\VICOKOBY" "0"

Page directory
Page instfiles

Section Main
  ; We can change anything explicitly. No random changes make users happy.
  ; Also, no pollution after cancelling the installation beyond the dir page
  WriteRegStr HKCU "SOFTWARE\VICOKOBY" "0" "$InstDir"
SectionEnd