diff --git a/runtime/syntax/msidl.vim b/runtime/syntax/msidl.vim
new file mode 100644
index 0000000..cf270eeb
--- /dev/null
+++ b/runtime/syntax/msidl.vim
@@ -0,0 +1,92 @@
+" Vim syntax file
+" Language:     MS IDL (Microsoft dialect of Interface Description Language)
+" Maintainer:   Vadim Zeitlin <vadim@wxwindows.org>
+" Last Change:  2003 May 11
+
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if version < 600
+  syntax clear
+elseif exists("b:current_syntax")
+  finish
+endif
+
+" Misc basic
+syn match   msidlId		"[a-zA-Z][a-zA-Z0-9_]*"
+syn match   msidlUUID		"{\?[[:xdigit:]]\{8}-\([[:xdigit:]]\{4}-\)\{3}[[:xdigit:]]\{12}}\?"
+syn region  msidlString		start=/"/  skip=/\\\(\\\\\)*"/	end=/"/
+syn match   msidlLiteral	"\d\+\(\.\d*\)\="
+syn match   msidlLiteral	"\.\d\+"
+syn match   msidlSpecial	contained "[]\[{}:]"
+
+" Comments
+syn keyword msidlTodo		contained TODO FIXME XXX
+syn region  msidlComment	start="/\*"  end="\*/" contains=msidlTodo
+syn match   msidlComment	"//.*" contains=msidlTodo
+syn match   msidlCommentError	"\*/"
+
+" C style Preprocessor
+syn region  msidlIncluded	contained start=+"+  skip=+\\\(\\\\\)*"+  end=+"+
+syn match   msidlIncluded	contained "<[^>]*>"
+syn match   msidlInclude	"^[ \t]*#[ \t]*include\>[ \t]*["<]" contains=msidlIncluded,msidlString
+syn region  msidlPreCondit	start="^[ \t]*#[ \t]*\(if\>\|ifdef\>\|ifndef\>\|elif\>\|else\>\|endif\>\)"  skip="\\$"	end="$" contains=msidlComment,msidlCommentError
+syn region  msidlDefine		start="^[ \t]*#[ \t]*\(define\>\|undef\>\)" skip="\\$" end="$" contains=msidlLiteral, msidlString
+
+" Attributes
+syn keyword msidlAttribute      contained in out propget propput propputref retval
+syn keyword msidlAttribute      contained aggregatable appobject binadable coclass control custom default defaultbind defaultcollelem defaultvalue defaultvtable dispinterface displaybind dual entry helpcontext helpfile helpstring helpstringdll hidden id immediatebind lcid library licensed nonbrowsable noncreatable nonextensible oleautomation optional object public readonly requestedit restricted source string uidefault usesgetlasterror vararg version
+syn match   msidlAttribute      /uuid(.*)/he=s+4 contains=msidlUUID
+syn match   msidlAttribute      /helpstring(.*)/he=s+10 contains=msidlString
+syn region  msidlAttributes     start="\[" end="]" keepend contains=msidlSpecial,msidlString,msidlAttribute,msidlComment,msidlCommentError
+
+" Keywords
+syn keyword msidlEnum		enum
+syn keyword msidlImport		import importlib
+syn keyword msidlStruct		interface library coclass
+syn keyword msidlTypedef	typedef
+
+" Types
+syn keyword msidlStandardType   byte char double float hyper int long short void wchar_t
+syn keyword msidlStandardType   BOOL BSTR HRESULT VARIANT VARIANT_BOOL
+syn region  msidlSafeArray      start="SAFEARRAY(" end=")" contains=msidlStandardType
+
+syn sync lines=50
+
+" Define the default highlighting.
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlighting yet
+if version >= 508 || !exists("did_msidl_syntax_inits")
+  if version < 508
+    let did_msidl_syntax_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+  HiLink msidlInclude		Include
+  HiLink msidlPreProc		PreProc
+  HiLink msidlPreCondit		PreCondit
+  HiLink msidlDefine		Macro
+  HiLink msidlIncluded		String
+  HiLink msidlString		String
+  HiLink msidlComment		Comment
+  HiLink msidlTodo		Todo
+  HiLink msidlSpecial		SpecialChar
+  HiLink msidlLiteral		Number
+  HiLink msidlUUID		Number
+
+  HiLink msidlImport		Include
+  HiLink msidlEnum		StorageClass
+  HiLink msidlStruct		Structure
+  HiLink msidlTypedef		Typedef
+  HiLink msidlAttribute		StorageClass
+
+  HiLink msidlStandardType	Type
+  HiLink msidlSafeArray		Type
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "msidl"
+
+" vi: set ts=8 sw=4: