diff --git a/src/WindowsInstaller/FreeCAD-installer.nsi b/src/WindowsInstaller/FreeCAD-installer.nsi
index 2ceeea5987..eb98272bad 100644
--- a/src/WindowsInstaller/FreeCAD-installer.nsi
+++ b/src/WindowsInstaller/FreeCAD-installer.nsi
@@ -34,23 +34,22 @@ ManifestDPIAware true
 !define MULTIUSER_MUI
 
 # included NSIS files
-!include MUI2.nsh
+!include InstallOptions.nsh
+!include LangFile.nsh
+!include Library.nsh
 !include LogicLib.nsh
+!include MUI2.nsh
+!include MultiUser.nsh
 !include Sections.nsh
 !include WinVer.nsh
-!include LangFile.nsh
-!include MultiUser.nsh
-!include InstallOptions.nsh
 !include x64.nsh
+
 # load the nsPprocess plugin
 !include nsProcess.nsh
 
 # Set of various macros and functions
 !include include\utils.nsh
 
-# detect third-party programs
-!include include\detection.nsh
-
 # set up the installer pages
 !include include\gui.nsh
 
diff --git a/src/WindowsInstaller/Settings.nsh b/src/WindowsInstaller/Settings.nsh
index b4d66973cb..9c38df1513 100644
--- a/src/WindowsInstaller/Settings.nsh
+++ b/src/WindowsInstaller/Settings.nsh
@@ -18,7 +18,7 @@ SetCompressor /SOLID lzma
 !define APP_VERSION_MAJOR 0
 !define APP_VERSION_MINOR 19
 !define APP_VERSION_REVISION 0
-!define APP_VERSION_EMERGENCY "rev18542" # use "1" for an emergency release of FreeCAD otherwise ""
+!define APP_VERSION_EMERGENCY "rev18731" # use "1" for an emergency release of FreeCAD otherwise ""
 	# alternatively you can use APP_VERSION_EMERGENCY for a custom suffix of the version number
 !define APP_EMERGENCY_DOT "" # use "." for an emergency release of FreeCAD otherwise ""
 !define APP_VERSION_BUILD 1 # Start with 1 for the installer releases of each version
@@ -45,3 +45,4 @@ SetCompressor /SOLID lzma
 
 !define FILES_FREECAD "D:\usti\FreeCAD\Installer\FreeCAD"
 !define FILES_DEPS "D:\usti\FreeCAD\Installer\MSVCRedist"
+!define FILES_THUMBS "D:\usti\FreeCAD\Installer\thumbnail"
diff --git a/src/WindowsInstaller/include/declarations.nsh b/src/WindowsInstaller/include/declarations.nsh
index 5b79a4bfb3..03e26d9b6a 100644
--- a/src/WindowsInstaller/include/declarations.nsh
+++ b/src/WindowsInstaller/include/declarations.nsh
@@ -69,7 +69,6 @@ Var CreateFileAssociations
 Var OldVersionNumber
 Var Pointer
 Var Search
-Var SVGPath
 Var StartmenuFolder
 Var String
 Var UserList
diff --git a/src/WindowsInstaller/include/detection.nsh b/src/WindowsInstaller/include/detection.nsh
deleted file mode 100644
index 28fb4a803d..0000000000
--- a/src/WindowsInstaller/include/detection.nsh
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
-
-detection.nsh
-
-Detection of external component locations
-
-*/
-
-# This script contains the following functions:
-#
-# - SearchExternal, calls the functions:
-#    MissingPrograms
-#
-# - MissingPrograms, (check if third-party programs are installed), uses:
-#    SEARCH_MIKTEX
-#    SEARCH_TEXLIVE
-#
-#--------------------------
-
-Function SearchExternal
-  Call MissingPrograms
-FunctionEnd
-
-# ---------------------------------------
-
-Function MissingPrograms
-  # check if third-party programs are installed
-
- ${if} ${RunningX64}
-   SetRegView 64
-  ${endif}
-
-  # test if Inkscape is installed
-  ReadRegStr $SVGPath HKLM "SOFTWARE\Classes\inkscape.svg\DefaultIcon" ""
-  ${if} $SVGPath != ""
-   StrCpy $SVGPath $SVGPath "" 1 # remove the leading quote
-   StrCpy $SVGPath $SVGPath -14 # # delete '\inkscape.exe"'
-  ${endif}
-  ${if} $SVGPath == ""
-   # this was used before Inkscape 0.91:
-   ReadRegStr $SVGPath HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Inkscape" "InstallLocation"
-  ${endif}
-
-FunctionEnd
-
-# ---------------------------------------
diff --git a/src/WindowsInstaller/include/init.nsh b/src/WindowsInstaller/include/init.nsh
index 145a38d025..c6b5a534ca 100644
--- a/src/WindowsInstaller/include/init.nsh
+++ b/src/WindowsInstaller/include/init.nsh
@@ -60,6 +60,7 @@ Function .onInit
   # check if it is a 64bit system
   ${if} ${RunningX64}
    SetRegView 64
+   !define LIBRARY_X64
   ${endif}
   
   # Check that FreeCAD is not currently running
@@ -149,11 +150,6 @@ Function .onInit
   ${IfNot} ${Silent}
     # Show banner while installer is intializating 
     Banner::show /NOUNLOAD "Checking system"
-  ${EndIf}
- 
-  Call SearchExternal
-  
-  ${IfNot} ${Silent}
     Banner::destroy
   ${EndIf}
 
diff --git a/src/WindowsInstaller/setup/configure.nsh b/src/WindowsInstaller/setup/configure.nsh
index 7b576fae4e..70d9a900c8 100644
--- a/src/WindowsInstaller/setup/configure.nsh
+++ b/src/WindowsInstaller/setup/configure.nsh
@@ -75,9 +75,6 @@ Section -Configure
 
   ${if} $CreateFileAssociations == "true"
    WriteRegStr SHCTX "${APP_DIR_REGKEY}" "" "$INSTDIR\${APP_RUN}"
-  ${endif}
-
-  ${if} $CreateFileAssociations == "true"
    WriteRegStr SHCTX "Software\Classes\${APP_REGNAME_DOC}" "" "${APP_NAME} Document"
    WriteRegStr SHCTX "Software\Classes\${APP_REGNAME_DOC}\DefaultIcon" "" "$INSTDIR\${APP_RUN},0"
    WriteRegStr SHCTX "Software\Classes\${APP_REGNAME_DOC}\Shell\open\command" "" '"$INSTDIR\${APP_RUN}" "%1"'
@@ -90,9 +87,15 @@ Section -Configure
    # .FCStd
    WriteRegStr SHCTX "Software\Classes\${APP_EXT}" "" "${APP_REGNAME_DOC}"
    WriteRegStr SHCTX "Software\Classes\${APP_EXT}" "Content Type" "${APP_MIME_TYPE}"
-   # FIXME: what about .FCMat and .FCMacro?
-  
-   # Refresh shell
+   # if the user is admin, also install the DLL toe preview .FCStd files
+   ${if} $MultiUser.Privileges == "Admin"
+    # see https://nsis.sourceforge.io/Docs/AppendixB.html#library_install for a description of InstallLib
+    !insertmacro InstallLib REGDLL NOTSHARED NOREBOOT_NOTPROTECTED ${FILES_THUMBS}\FCStdThumbnail.dll $SYSDIR\FCStdThumbnail.dll $SYSDIR
+   ${endif}
+   # in any case remove the FCStdThumbnail.dll
+   RMDir /r "$INSTDIR\thumbnail"
+   
+   # Eventually refresh shell icons
    ${RefreshShellIcons}
   ${endif}
   
diff --git a/src/WindowsInstaller/setup/install.nsh b/src/WindowsInstaller/setup/install.nsh
index cc186b4a25..6b9f689158 100644
--- a/src/WindowsInstaller/setup/install.nsh
+++ b/src/WindowsInstaller/setup/install.nsh
@@ -44,6 +44,7 @@ Section -ProgramFiles SecProgramFiles
   File /r "${FILES_FREECAD}\lib"
   File /r "${FILES_FREECAD}\Mod"
   File /r "${FILES_FREECAD}\resources"
+  File /r "${FILES_THUMBS}"
     
   # Create uninstaller
   WriteUninstaller "$INSTDIR\${SETUP_UNINSTALLER}"
diff --git a/src/WindowsInstaller/setup/uninstall.nsh b/src/WindowsInstaller/setup/uninstall.nsh
index 9dbbb89658..bb70129448 100644
--- a/src/WindowsInstaller/setup/uninstall.nsh
+++ b/src/WindowsInstaller/setup/uninstall.nsh
@@ -28,6 +28,8 @@ Section "un.FreeCAD" un.SecUnProgramFiles
   ${endif}
   ${if} $MultiUser.Privileges == "Admin"
    DeleteRegKey HKCR "${APP_NAME}.Document"
+   # see https://nsis.sourceforge.io/Docs/AppendixB.html#library_install for a description of UnInstallLib
+   !insertmacro UnInstallLib REGDLL NOTSHARED NOREBOOT_NOTPROTECTED $SYSDIR\FCStdThumbnail.dll
   ${endif}
 
   # Uninstaller itself
@@ -55,6 +57,9 @@ Section "un.FreeCAD" un.SecUnProgramFiles
   # clean other registry entries
   DeleteRegKey SHCTX "SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\${APP_NAME}.exe"
   DeleteRegKey SHCTX "SOFTWARE\${APP_REGKEY}"
+  
+  # Eventually refresh shell icons
+   ${RefreshShellIcons}
 
 SectionEnd
 
diff --git a/src/WindowsInstaller/thumbnail/FCStdThumbnail.dll b/src/WindowsInstaller/thumbnail/FCStdThumbnail.dll
new file mode 100644
index 0000000000..422727663d
Binary files /dev/null and b/src/WindowsInstaller/thumbnail/FCStdThumbnail.dll differ