How to imap in gvim in windows 8 for vim 7.4?

I don't understand why this is not working in GVIM:

imap <pagedown> <c-n>

Any help appreciated!

I'm running gvim 7.4 on a windows 8 platform. The output of :ver is shown at the end

Thanks!

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VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Aug 10 2013 14:38:33)
MS-Windows 32-bit GUI version with OLE support
Compiled by mool@tororo
Big version with GUI. Features included (+) or not (-):
+arabic +ex_extra +mouseshape +syntax
+autocmd +extra_search +multi_byte_ime/dyn +tag_binary
+balloon_eval +farsi +multi_lang +tag_old_static
+browse +file_in_path -mzscheme -tag_any_white
++builtin_terms +find_in_path +netbeans_intg +tcl/dyn
+byte_offset +float +ole -tgetent
+cindent +folding +path_extra -termresponse
+clientserver -footer +perl/dyn +textobjects
+clipboard +gettext/dyn +persistent_undo +title
+cmdline_compl -hangul_input -postscript +toolbar
+cmdline_hist +iconv/dyn +printer +user_commands
+cmdline_info +insert_expand -profile +vertsplit
+comments +jumplist +python/dyn +virtualedit
+conceal +keymap +python3/dyn +visual
+cryptv +langmap +quickfix +visualextra
+cscope +libcall +reltime +viminfo
+cursorbind +linebreak +rightleft +vreplace
+cursorshape +lispindent +ruby/dyn +wildignore
+dialog_con_gui +listcmds +scrollbind +wildmenu
+diff +localmap +signs +windows
+digraphs -lua +smartindent +writebackup
-dnd +menu -sniff -xfontset
-ebcdic +mksession +startuptime -xim
+emacs_tags +modify_fname +statusline -xterm_save
+eval +mouse -sun_workshop +xpm_w32
system vimrc file: "$VIM\vimrc"
user vimrc file: "$HOME\_vimrc"
2nd user vimrc file: "$HOME\vimfiles\vimrc"
3rd user vimrc file: "$VIM\_vimrc"
user exrc file: "$HOME\_exrc"
2nd user exrc file: "$VIM\_exrc"
system gvimrc file: "$VIM\gvimrc"
user gvimrc file: "$HOME\_gvimrc"
2nd user gvimrc file: "$HOME\vimfiles\gvimrc"
3rd user gvimrc file: "$VIM\_gvimrc"
system menu file: "$VIMRUNTIME\menu.vim"
Compilation: cl -c /W3 /nologo -I. -Iproto -DHAVE_PATHDEF -DWIN32 -DFEAT_CSCOPE -D
FEAT_NETBEANS_INTG -DFEAT_XPM_W32 -DWINVER=0x0400 -D_WIN32_WINNT=0x0400 /Fo.\Obj
GOLYHTRi386/ /Ox /GL -DNDEBUG /Zl /MT -DFEAT_OLE -DFEAT_MBYTE_IME -DDYNAMIC_IME -DFE
AT_GUI_W32 -DDYNAMIC_ICONV -DDYNAMIC_GETTEXT -DFEAT_TCL -DDYNAMIC_TCL -DDYNAMIC_TCL_D
LL=\"tcl85.dll\" -DDYNAMIC_TCL_VER=\"8.5\" -DFEAT_PYTHON -DDYNAMIC_PYTHON -DDYNAMIC_P
YTHON_DLL=\"python27.dll\" -DFEAT_PYTHON3 -DDYNAMIC_PYTHON3 -DDYNAMIC_PYTHON3_DLL=\"p
ython32.dll\" -DFEAT_PERL -DDYNAMIC_PERL -DDYNAMIC_PERL_DLL=\"perl514.dll\" -DFEAT_RU
BY -DDYNAMIC_RUBY -DDYNAMIC_RUBY_VER=19 -DDYNAMIC_RUBY_DLL=\"msvcrt-ruby192.dll\" -DF
EAT_BIG /Fd.\ObjGOLYHTRi386/ /Zi
Linking: link /RELEASE /nologo /subsystem:windows /LTCG:STATUS oldnames.lib kernel32.
lib advapi32.lib shell32.lib gdi32.lib comdlg32.lib ole32.lib uuid.lib /machine:i386
/nodefaultlib gdi32.lib version.lib winspool.lib comctl32.lib advapi32.lib shell32
.lib /machine:i386 /nodefaultlib libcmt.lib oleaut32.lib user32.lib /nodefault
lib:python27.lib /nodefaultlib:python32.lib "E:\tcl\lib\tclstub85.lib" WSock32.lib
xpm\x86\lib\libXpm.lib /PDB:gvim.pdb -debug

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