diff --git a/development/Win32/packaging/AltInstaller/Aspell.nsh b/development/Win32/packaging/AltInstaller/Aspell.nsh
index 802cca1aec..4817a173ac 100644
--- a/development/Win32/packaging/AltInstaller/Aspell.nsh
+++ b/development/Win32/packaging/AltInstaller/Aspell.nsh
@@ -11,6 +11,11 @@ Function InstallAspell
    File /r "${PRODUCT_SOURCEDIR}\${AspellInstall}"
    # copy the files and register Aspell
    CopyFiles "$INSTDIR\${AspellInstall}" "$APPDATA"
+   # finally copy the Aspell personal files to the Application folder of all users
+   # this assures that every user can have its own word list
+   StrCpy $AppSubfolder "Aspell"
+   StrCpy $AppFiles "$APPDATA\Aspell\Personal"
+   Call CreateAppPathSub # function from LyXUtils.nsh
    
    WriteRegStr HKLM "SOFTWARE\Aspell" "Base Path" "${AspellDir}"
    WriteRegStr HKLM "SOFTWARE\Aspell" "Dictionary Path" "${AspellDictPath}"
@@ -245,7 +250,13 @@ Function InstallAspellDictionary
  DownloadNow:
   ExecShell "open" "${AspellLocationExact}"
  DownloadLater:
-	 
+
+ # finally copy the Aspell dictionary files to the Application folder of all users
+ # this assures that every user can have its own word list
+ StrCpy $AppSubfolder "Aspell"
+ StrCpy $AppFiles "$APPDATA\Aspell\Dictionaries"
+ Call CreateAppPathSub # function from LyXUtils.nsh
+ 
 FunctionEnd
 
 !endif # endif ${INSTALLER_TYPE} == "NotUpdate"
@@ -258,6 +269,9 @@ Function un.UninstAspell
     ReadRegStr $1 SHCTX "Software\Aspell" "Base Path"
     # delete Aspells' install folder
     RMDir /r $1
+    # remove LyX's config files
+    StrCpy $AppSubfolder "Aspell"
+    Call un.DelAppPathSub # function from LyXUtils.nsh
     # unregister Aspell and its dictionaries
     DeleteRegKey SHCTX "Software\Aspell"
     DeleteRegKey SHCTX "Software\Microsoft\Windows\CurrentVersion\Uninstall\Aspell"
diff --git a/development/Win32/packaging/AltInstaller/ChangeLog.txt b/development/Win32/packaging/AltInstaller/ChangeLog.txt
index 9c5fffa7db..5c0b15d4dc 100644
--- a/development/Win32/packaging/AltInstaller/ChangeLog.txt
+++ b/development/Win32/packaging/AltInstaller/ChangeLog.txt
@@ -1,4 +1,15 @@
-Version 3.24
+Version 3.25
+- LyX 1.5.6
+
+- When Aspell is installed together with this installer (this will be the
+  case when Aspell is not already installed), now every user on the PC
+  gets his personal word list files.
+- The .lyx file extension is no longer removed when it was not created by
+  the LyX version that is uninstalled. (necessary to be able to install new LyX
+  versions without touching existing LyX installations)
+
+
+Version 3.24
 - LyX 1.5.5
 
 - updated to MiKTeX 2.7 (build 3053)
diff --git a/development/Win32/packaging/AltInstaller/ConfigLyX.nsh b/development/Win32/packaging/AltInstaller/ConfigLyX.nsh
index 70cc960971..d987bcd358 100644
--- a/development/Win32/packaging/AltInstaller/ConfigLyX.nsh
+++ b/development/Win32/packaging/AltInstaller/ConfigLyX.nsh
@@ -56,7 +56,7 @@ Function ConfigureLyX
   ${if} $Acrobat == "Yes" # used for Acrobat / Adobe Reader
     # writes settings to the preferences file
     ${LineFind} "$INSTDIR\Resources\preferences" "$INSTDIR\Resources\preferences" "75" "AcroPref"
-    # ${LineFind} macro from TextFunc.nsh # calls Function AcroPref
+    # ${LineFind} is a macro from TextFunc.nsh # calls Function AcroPref
   ${endif}
   
   # if a SVG to PDF converter ws found (e.g. Inkscape) define it in the preferences
@@ -106,6 +106,7 @@ Function ConfigureLyX
 
   # register the extension .lyx
   ${if} $CreateFileAssociations == "true"
+   WriteRegStr SHCTX "${PRODUCT_DIR_REGKEY}" "OnlyWithLyX" "Yes${PRODUCT_VERSION_SHORT}" # special entry to test if they were registered by this LyX version
    # write informations about file type
    WriteRegStr SHCTX "Software\Classes\${PRODUCT_REGNAME}" "" "${PRODUCT_NAME} Document"
    WriteRegStr SHCTX "Software\Classes\${PRODUCT_REGNAME}\DefaultIcon" "" "${PRODUCT_EXE}"
@@ -120,7 +121,10 @@ Function ConfigureLyX
   # create the LyX Application Data folder for all users
   # this folder is automatically created by LyX when it is first started but we want to start LyX with a specific session file,
   # so we create this folder before LyX starts and copy there the session file
+  StrCpy $AppSubfolder ${PRODUCT_SUBFOLDER}
+  StrCpy $AppFiles "$INSTDIR\Resources\session"
   Call CreateAppPathSub # function from LyXUtils.nsh
+  Delete "$INSTDIR\Resources\session" # delete the session file in the INSTDIR because it is unneeded there
   
   # delete unnecessary files
   ${if} $DelPythonFiles == "True"
@@ -154,7 +158,7 @@ FunctionEnd
 # --------------------------------
 
 Function AcroPref
- # writes PDF settings  to the preferences file
+ # writes PDF settings to the preferences file
 
   FileWrite $R4 '\format "pdf3" "pdf" "PDF (dvipdfm)" "m" "pdfview" "" "document,vector"$\r$\n\
 		 \format "pdf2" "pdf" "PDF (pdflatex)" "F" "pdfview" "" "document,vector"$\r$\n\
diff --git a/development/Win32/packaging/AltInstaller/LyXInstaller-complete.nsi b/development/Win32/packaging/AltInstaller/LyXInstaller-complete.nsi
index 0ae99f5fe3..8bbf226b34 100644
--- a/development/Win32/packaging/AltInstaller/LyXInstaller-complete.nsi
+++ b/development/Win32/packaging/AltInstaller/LyXInstaller-complete.nsi
@@ -56,37 +56,7 @@ Var InstallGSview
 Var InstallJabRef
 Var SVGPath
 # Variables used by all installer versions
-Var AspellInstallYes
-Var AspellBaseReg
-Var AspellMessage
-Var ImageMagickPath
-Var JabRefInstalled
-Var LatexPath
-Var MiKTeXInstalled
-Var PythonPath
-Var Answer
-Var AppPre
-Var AppSuff
-Var AppPath
-Var CreateDesktopIcon
-Var CreateFileAssociations
-Var DictCode
-Var FileName
-Var LangCode
-Var LangCodeSys
-Var LangName
-Var LangNameSys
-Var NewString
-Var OldString
-Var PathPrefix
-Var Pointer
-Var ProductRootKey
-Var RunNumber
-Var StartmenuFolder
-Var String
-Var Search
-Var UserList
-Var UserName
+!include "Variables.nsh"
 
 #--------------------------------
 # load some NSIS libraries
diff --git a/development/Win32/packaging/AltInstaller/LyXInstaller-small.nsi b/development/Win32/packaging/AltInstaller/LyXInstaller-small.nsi
index 812bb516d4..85d8ef895b 100644
--- a/development/Win32/packaging/AltInstaller/LyXInstaller-small.nsi
+++ b/development/Win32/packaging/AltInstaller/LyXInstaller-small.nsi
@@ -54,37 +54,7 @@ Var MiKTeXUser
 Var State
 Var SVGPath
 # Variables used by all installer versions
-Var AspellInstallYes
-Var AspellBaseReg
-Var AspellMessage
-Var ImageMagickPath
-Var JabRefInstalled
-Var LatexPath
-Var MiKTeXInstalled
-Var PythonPath
-Var Answer
-Var AppPre
-Var AppSuff
-Var AppPath
-Var CreateDesktopIcon
-Var CreateFileAssociations
-Var DictCode
-Var FileName
-Var LangCode
-Var LangCodeSys
-Var LangName
-Var LangNameSys
-Var NewString
-Var OldString
-Var PathPrefix
-Var Pointer
-Var ProductRootKey
-Var RunNumber
-Var StartmenuFolder
-Var String
-Var Search
-Var UserList
-Var UserName
+!include "Variables.nsh"
 
 #--------------------------------
 # load some NSIS libraries
diff --git a/development/Win32/packaging/AltInstaller/LyXInstaller-update.nsi b/development/Win32/packaging/AltInstaller/LyXInstaller-update.nsi
index 9bcb5a132a..16d6ff7ed6 100644
--- a/development/Win32/packaging/AltInstaller/LyXInstaller-update.nsi
+++ b/development/Win32/packaging/AltInstaller/LyXInstaller-update.nsi
@@ -38,37 +38,7 @@ SetCompressor lzma
 Var INSTDIR_NEW
 Var INSTDIR_OLD
 # Variables used by all installer versions
-Var AspellInstallYes
-Var AspellBaseReg
-Var AspellMessage
-Var ImageMagickPath
-Var JabRefInstalled
-Var LatexPath
-Var MiKTeXInstalled
-Var PythonPath
-Var Answer
-Var AppPre
-Var AppSuff
-Var AppPath
-Var CreateDesktopIcon
-Var CreateFileAssociations
-Var DictCode
-Var FileName
-Var LangCode
-Var LangCodeSys
-Var LangName
-Var LangNameSys
-Var NewString
-Var OldString
-Var PathPrefix
-Var Pointer
-Var ProductRootKey
-Var RunNumber
-Var StartmenuFolder
-Var String
-Var Search
-Var UserList
-Var UserName
+!include "Variables.nsh"
 
 #--------------------------------
 # load some NSIS libraries
diff --git a/development/Win32/packaging/AltInstaller/LyXUtils.nsh b/development/Win32/packaging/AltInstaller/LyXUtils.nsh
index bf06616960..8de5de61dd 100644
--- a/development/Win32/packaging/AltInstaller/LyXUtils.nsh
+++ b/development/Win32/packaging/AltInstaller/LyXUtils.nsh
@@ -307,13 +307,11 @@ Function un.DelAppPathSub
    StrCpy $UserList $UserList "" $Pointer # cut off the first username in the list
    # generate the string for the current user
    # AppPre and AppSuff are generated in the macro "AppPreSuff"
-   StrCpy $AppPath "$AppPre\$0\$AppSuff\${PRODUCT_SUBFOLDER}"
-   RMDir /r $AppPath # delete the folder
+   RMDir /r "$AppPre\$0\$AppSuff\$AppSubfolder" # delete the folder
   Goto loop
   ready:
   StrCpy $0 $UserList
-  StrCpy $AppPath "$AppPre\$0\$AppSuff\${PRODUCT_SUBFOLDER}"
-  RMDir /r $AppPath # delete the folder
+  RMDir /r "$AppPre\$0\$AppSuff\$AppSubfolder" # delete the folder
   
 FunctionEnd
 
@@ -350,17 +348,14 @@ FunctionEnd
    StrCpy $UserList $UserList "" $Pointer # cut off the first username in the list
    # generate the string for the current user
    # AppPre and AppSuff are generated in the macro "AppPreSuff"
-   StrCpy $AppPath "$AppPre\$0\$AppSuff\${PRODUCT_SUBFOLDER}"
-   CreateDirectory $AppPath # create the folder
-   CopyFiles "$INSTDIR\Resources\session" "$AppPath"
+   CreateDirectory "$AppPre\$0\$AppSuff\$AppSubfolder" # create the folder
+   CopyFiles "$AppFiles" "$AppPre\$0\$AppSuff\$AppSubfolder"
   Goto loop
   ready:
   # now do the same for the last user name
   StrCpy $0 $UserList
-  StrCpy $AppPath "$AppPre\$0\$AppSuff\${PRODUCT_SUBFOLDER}"
-  CreateDirectory $AppPath # create the folder
-  CopyFiles "$INSTDIR\Resources\session" "$AppPath"
-  Delete "$INSTDIR\Resources\session" # delete the session file in the INSTDIR because it is unneeded there
+  CreateDirectory "$AppPre\$0\$AppSuff\$AppSubfolder" # create the folder
+  CopyFiles "$AppFiles" "$AppPre\$0\$AppSuff\$AppSubfolder"
   
  FunctionEnd
 
diff --git a/development/Win32/packaging/AltInstaller/Settings.nsh b/development/Win32/packaging/AltInstaller/Settings.nsh
index 8c9412801e..5b22a59a34 100644
--- a/development/Win32/packaging/AltInstaller/Settings.nsh
+++ b/development/Win32/packaging/AltInstaller/Settings.nsh
@@ -19,12 +19,12 @@
 !define PRODUCT_INFO_URL "http://www.lyx.org/"
 !define LAUNCHER_EXE "$INSTDIR\bin\LyXLauncher.exe"
 
-BrandingText "LyXWinInstaller v3.24 - ${INSTALLER_VERSION}"
+BrandingText "LyXWinInstaller v3.25 - ${INSTALLER_VERSION}"
 
 # to check later if this installer version is running at the same time
-!define INSTALLER_EXE "LyX-${PRODUCT_VERSION_SHORT}-3-24-AltInstaller-${INSTALLER_VERSION}.exe"
-!define INSTALLER2_EXE "LyX-${PRODUCT_VERSION_SHORT}-3-24-AltInstaller-${INSTALLER2_VERSION}.exe"
-!define INSTALLER3_EXE "LyX-${PRODUCT_VERSION_SHORT}-3-24-AltInstaller-${INSTALLER3_VERSION}.exe"
+!define INSTALLER_EXE "LyX-${PRODUCT_VERSION_SHORT}-3-25-AltInstaller-${INSTALLER_VERSION}.exe"
+!define INSTALLER2_EXE "LyX-${PRODUCT_VERSION_SHORT}-3-25-AltInstaller-${INSTALLER2_VERSION}.exe"
+!define INSTALLER3_EXE "LyX-${PRODUCT_VERSION_SHORT}-3-25-AltInstaller-${INSTALLER3_VERSION}.exe"
 !define VERSION_BITMAP "${PRODUCT_DIR}\icons\lyx_logo_vert${PRODUCT_VERSION_SHORT}.bmp"
 
 # Replaced by HKLM or HKCU depending on SetShellVarContext.
@@ -35,15 +35,16 @@ BrandingText "LyXWinInstaller v3.24 - ${INSTALLER_VERSION}"
 !define SHCNF_IDLIST 0
 !define PRODUCT_DIR_REGKEY "Software\Microsoft\Windows\CurrentVersion\App Paths\lyx.exe"
 !define PRODUCT_UNINST_KEY "Software\Microsoft\Windows\CurrentVersion\Uninstall\LyX${PRODUCT_VERSION_SHORT}"
+!define PRODUCT_DIR_REGKEY_2 "Software\LyX\LyX-${PRODUCT_VERSION}"
 
 # definitions for the Update installer
 !if ${INSTALLER_VERSION} == "Update"
- !define PRODUCT_UNINST_KEY_OLD "Software\Microsoft\Windows\CurrentVersion\Uninstall\LyX154"
- !define PRODUCT_VERSION_OLD "LyX 1.5.4"
- !define PRODUCT_VERSION_SHORT_OLD "154"
+ !define PRODUCT_UNINST_KEY_OLD "Software\Microsoft\Windows\CurrentVersion\Uninstall\LyX155"
+ !define PRODUCT_VERSION_OLD "LyX 1.5.5"
+ !define PRODUCT_VERSION_SHORT_OLD "155"
  !define JabRefVersion "2.3.1" # could be an older version
  !define ImageMagickVersion_Old "6.3.8" # could be an older version
- !define GhostscriptVersion_Old "8.61" # could be an older version
+ !define GhostscriptVersion_Old "8.62" # could be an older version
  !define MiKTeXDeliveredVersion "2.7" # could be an older version
 !endif
 
diff --git a/development/Win32/packaging/AltInstaller/Uninstall.nsh b/development/Win32/packaging/AltInstaller/Uninstall.nsh
index bd7ad6de8b..2de001efd9 100644
--- a/development/Win32/packaging/AltInstaller/Uninstall.nsh
+++ b/development/Win32/packaging/AltInstaller/Uninstall.nsh
@@ -115,13 +115,7 @@ Section "un.LyX" un.SecUnProgramFiles
   RMDir /r "$0"
   # delete desktop icon
   Delete "$DESKTOP\LyX ${PRODUCT_VERSION}.lnk"
-  # delete registry entries
-  DeleteRegKey HKCU "${PRODUCT_UNINST_KEY}"
-  DeleteRegKey SHCTX "${PRODUCT_UNINST_KEY}"
-  DeleteRegKey SHCTX "${PRODUCT_DIR_REGKEY}"
-  DeleteRegKey HKCR "Applications\lyx.exe"
-  DeleteRegKey HKCR "Applications\lyx.bat"
-
+  
   # Aiksaurus
   !insertmacro FileCheck $5 "meanings.dat" "${AiksaurusDir}" # macro from LyXUtils.nsh
   ${if} $5 == "True"
@@ -136,11 +130,22 @@ Section "un.LyX" un.SecUnProgramFiles
   ${endif}
 
   # remove file extension .lyx
-  ReadRegStr $R0 SHCTX "Software\Classes\${PRODUCT_EXT}" ""
-  ${if} $R0 == "${PRODUCT_REGNAME}"
-   DeleteRegKey SHCTX "Software\Classes\${PRODUCT_EXT}"
-   DeleteRegKey SHCTX "Software\Classes\${PRODUCT_REGNAME}"
+  ReadRegStr $0 SHCTX "${PRODUCT_DIR_REGKEY}" "OnlyWithLyX" # special entry to test if they were registered by this LyX version
+  ${if} $0 == "Yes${PRODUCT_VERSION_SHORT}"
+   ReadRegStr $R0 SHCTX "Software\Classes\${PRODUCT_EXT}" ""
+   ${if} $R0 == "${PRODUCT_REGNAME}"
+    DeleteRegKey SHCTX "Software\Classes\${PRODUCT_EXT}"
+    DeleteRegKey SHCTX "Software\Classes\${PRODUCT_REGNAME}"
+   ${endif}
   ${endif}
+  
+  # delete registry entries
+  DeleteRegKey HKCU "${PRODUCT_UNINST_KEY}"
+  DeleteRegKey SHCTX "${PRODUCT_UNINST_KEY}"
+  DeleteRegKey SHCTX "${PRODUCT_DIR_REGKEY}"
+  DeleteRegKey HKCU "${PRODUCT_DIR_REGKEY_2}"
+  DeleteRegKey HKCR "Applications\lyx.exe"
+  DeleteRegKey HKCR "Applications\lyx.bat"
 
   # the following can only be done with admin permissions
   ${if} $Answer == "yes" # if admin
@@ -185,6 +190,7 @@ SectionEnd
 Section "un.$(UnLyXPreferencesTitle)" un.SecUnPreferences
 
  # remove LyX's config files
+ StrCpy $AppSubfolder ${PRODUCT_SUBFOLDER}
  Call un.DelAppPathSub # function from LyXUtils.nsh
   
 SectionEnd
diff --git a/development/Win32/packaging/AltInstaller/Variables.nsh b/development/Win32/packaging/AltInstaller/Variables.nsh
new file mode 100644
index 0000000000..ffcc009561
--- /dev/null
+++ b/development/Win32/packaging/AltInstaller/Variables.nsh
@@ -0,0 +1,33 @@
+# Variables used by all installer versions
+Var AspellInstallYes
+Var AspellBaseReg
+Var AspellMessage
+Var ImageMagickPath
+Var JabRefInstalled
+Var LatexPath
+Var MiKTeXInstalled
+Var PythonPath
+Var Answer
+Var AppFiles
+Var AppPre
+Var AppSubfolder
+Var AppSuff
+Var CreateDesktopIcon
+Var CreateFileAssociations
+Var DictCode
+Var FileName
+Var LangCode
+Var LangCodeSys
+Var LangName
+Var LangNameSys
+Var NewString
+Var OldString
+Var PathPrefix
+Var Pointer
+Var ProductRootKey
+Var RunNumber
+Var StartmenuFolder
+Var String
+Var Search
+Var UserList
+Var UserName
diff --git a/development/Win32/packaging/AltInstaller/icons/lyx_logo_vert153.bmp b/development/Win32/packaging/AltInstaller/icons/lyx_logo_vert156.bmp
similarity index 94%
rename from development/Win32/packaging/AltInstaller/icons/lyx_logo_vert153.bmp
rename to development/Win32/packaging/AltInstaller/icons/lyx_logo_vert156.bmp
index beb62cf523..b1c61c7a5e 100644
Binary files a/development/Win32/packaging/AltInstaller/icons/lyx_logo_vert153.bmp and b/development/Win32/packaging/AltInstaller/icons/lyx_logo_vert156.bmp differ