Index: chicken-iup-2.iss
==================================================================
--- chicken-iup-2.iss
+++ chicken-iup-2.iss
@@ -44,5 +44,8 @@
 Name: "{commondesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon
 
 [Run]
 Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: nowait postinstall skipifsilent
 
+[Registry]
+Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment";
+    ValueType: expandsz; ValueName: "Path"; ValueData: "{olddata};C:\chicken\bin;C:\chicken\lib"

Index: chicken-iup.iss
==================================================================
--- chicken-iup.iss
+++ chicken-iup.iss
@@ -40,5 +40,10 @@
 Name: "{commondesktop}\chicken-iup"; Filename: "{app}\bin\csi.exe"; Tasks: desktopicon
 
 [Run]
 Filename: "{app}\bin\csi.exe"; Description: "{cm:LaunchProgram,chicken-iup}"; Flags: nowait postinstall skipifsilent
 
+[Registry]
+Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment";ValueType: expandsz; ValueName: "Path"; ValueData: "{olddata};C:\chicken\bin;C:\chicken\lib"
+Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment";ValueType: expandsz; ValueName: "CHICKEN_PREFIX"; ValueData: "{olddata};C:\chicken"
+Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment";ValueType: expandsz; ValueName: "CHICKEN_INSTALL_PREFIX"; ValueData: "{olddata};C:\chicken\lib\chicken\6"
+

Index: setup-chicken-iup.exe
==================================================================
--- setup-chicken-iup.exe
+++ setup-chicken-iup.exe
cannot compute difference between binary files