Added better handling of failures loading icons, as Cairo generated exception were crashing app under windows. Minor fix to handling missing processing params to not alter the global defaults.

languagePack.nsi

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+; RawTherapee Language Pack
+;
+; Installes just the language file in an existing RawTherapee installation.
+;
+;------------------------------------------------------------------------------
+; Name, Outputfile and Version information
+;------------------------------------------------------------------------------
+
+; **** start edit section: please adapt below options per language pack release ****
+; The name of the installer
+Name "RT 2.4.1 - language Pack"
+
+; The file to write
+OutFile "RT241-langPack-20091018.exe"
+
+LoadLanguageFile "${NSISDIR}\Contrib\Language files\English.nlf"
+
+  VIProductVersion "2.4.1.0"
+  VIAddVersionKey /LANG=${LANG_ENGLISH} "ProductName" "RawTherapee Language Pack"
+  VIAddVersionKey /LANG=${LANG_ENGLISH} "LegalCopyright" "<EFBFBD> Raw Therapee"
+  VIAddVersionKey /LANG=${LANG_ENGLISH} "FileDescription" "Language Pack RawTherapee 2.4.1"
+  VIAddVersionKey /LANG=${LANG_ENGLISH} "FileVersion" "2.4.1-2009-10-18"
+  VIAddVersionKey /LANG=${LANG_ENGLISH} "Comments" "Compatible also for RT2.4 and RT2.3"
+;  VIAddVersionKey /LANG=${LANG_ENGLISH} "CompanyName" "Fake company"
+;  VIAddVersionKey /LANG=${LANG_ENGLISH} "LegalTrademarks" "Test Application is a trademark of Fake company"
+
+; **** end edit section: no changes needed per release below ****
+
+;------------------------------------------------------------------------------
+; Installation Directory, Dialog box for 
+;------------------------------------------------------------------------------
+
+
+; The default installation directory
+InstallDir "$PROGRAMFILES\Raw Therapee\languages"
+DirText "The Language Pack has to be installed into the RawTherapee installation directory, into the language subdirectory." \
+        "RawTherapee Installation Directory" \
+        "" \
+        "Please select the installation Directory of RawTherapee:" 
+
+;PageEx directory
+;   DirVerify leave
+;   PageCallbacks "" "" dirLeave
+;PageExEnd
+
+; Registry key to check for directory (so if you install again, it will 
+; overwrite the old one automatically)
+InstallDirRegKey HKCU "Software\Raw Therapee" ""
+
+;------------------------------------------------------------------------------
+; Installation Rights (Vista only)
+;------------------------------------------------------------------------------
+
+; Request application privileges for Windows Vista
+RequestExecutionLevel admin
+
+
+;------------------------------------------------------------------------------
+; Pages:
+;------------------------------------------------------------------------------
+
+; Pages
+
+;Page components
+Page directory
+Page instfiles
+
+;UninstPage uninstConfirm
+;UninstPage instfiles
+
+;------------------------------------------------------------------------------
+; Sections: stuff to be installed
+;------------------------------------------------------------------------------
+
+; The stuff to install
+Section "RawTherapee Language Pack (required)"
+
+  SectionIn RO
+  
+  ifFileExists $INSTDIR\languages\*.* 0 +3
+  SetOutPath $INSTDIR\languages
+  Goto +2
+  SetOutPath $INSTDIR
+  
+  ; Set output path to the installation directory.
+  ;SetOutPath $INSTDIR
+  
+  ; Put file there
+  File "release\languages\*"
+  
+  ; Write the installation path into the registry
+  ;WriteRegStr HKLM SOFTWARE\NSIS_Example2 "Install_Dir" "$INSTDIR"
+  
+  ; Write the uninstall keys for Windows
+  ;WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Example2" "DisplayName" "NSIS Example2"
+  ;WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Example2" "UninstallString" '"$INSTDIR\uninstall.exe"'
+  ;WriteRegDWORD HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Example2" "NoModify" 1
+  ;WriteRegDWORD HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Example2" "NoRepair" 1
+  ;WriteUninstaller "uninstall.exe"
+  
+SectionEnd
+
+;------------------------------------------------------------------------------
+; Uninstaller: not needed here
+;------------------------------------------------------------------------------
+
+; Uninstaller
+
+;Section "Uninstall"
+  
+  ; Remove registry keys
+;  DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Example2"
+;  DeleteRegKey HKLM SOFTWARE\NSIS_Example2
+
+  ; Remove files and uninstaller
+;  Delete $INSTDIR\example2.nsi
+;  Delete $INSTDIR\uninstall.exe
+
+  ; Remove shortcuts, if any
+;  Delete "$SMPROGRAMS\Example2\*.*"
+
+  ; Remove directories used
+;  RMDir "$SMPROGRAMS\Example2"
+;  RMDir "$INSTDIR"
+
+;SectionEnd