diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ac3ba59cf0..d06dc9a92d 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,3 +1,10 @@
+# join offline doc parts
+if(WIN32)
+    EXECUTE_PROCESS(COMMAND powershell gc ${CMAKE_SOURCE_DIR}/src/Doc/freecad.qch.part* -Enc Byte -Read 1024 | sc ${CMAKE_BINARY_DIR}/src/Doc/freecad.qch -Enc Byte)
+	# gc is an alias for Get-Content, sc is an alias for Set-Content, -Read XXXX can be adjusted up for performance, if the user has insufficient RAM it might fail
+else(WIN32)
+    EXECUTE_PROCESS(COMMAND sh -c "cat ${CMAKE_SOURCE_DIR}/src/Doc/freecad.qch.part* >> ${CMAKE_BINARY_DIR}/src/Doc/freecad.qch" )
+endif(WIN32)
 
 add_subdirectory(Build)
 add_subdirectory(3rdParty)
@@ -9,7 +16,7 @@ add_subdirectory(Ext)
 if(BUILD_GUI)
     add_subdirectory(Gui)
     configure_file(Doc/freecad.qhc ${CMAKE_BINARY_DIR}/doc/freecad.qhc COPYONLY)
-    configure_file(Doc/freecad.qch ${CMAKE_BINARY_DIR}/doc/freecad.qch COPYONLY)
+    #configure_file(Doc/freecad.qch ${CMAKE_BINARY_DIR}/doc/freecad.qch COPYONLY)
 endif(BUILD_GUI)
 
 if(BUILD_TEMPLATE)
@@ -26,7 +33,7 @@ endif(FREECAD_MAINTAINERS_BUILD AND WIN32)
 
 INSTALL(FILES
     Doc/freecad.qhc
-    Doc/freecad.qch
+    ${CMAKE_BINARY_DIR}/src/Doc/freecad.qch
     Doc/ThirdPartyLibraries.html
     DESTINATION ${CMAKE_INSTALL_DOCDIR}
 )
diff --git a/src/Doc/freecad.qch b/src/Doc/freecad.qch
deleted file mode 100644
index 9bc8d1ce54..0000000000
Binary files a/src/Doc/freecad.qch and /dev/null differ
diff --git a/src/Doc/freecad.qhc b/src/Doc/freecad.qhc
index 6f59a3d168..aec9b065d5 100644
Binary files a/src/Doc/freecad.qhc and b/src/Doc/freecad.qhc differ