diff --git a/runtime/syntax/modsim3.vim b/runtime/syntax/modsim3.vim
new file mode 100644
index 0000000..04e9ab9
--- /dev/null
+++ b/runtime/syntax/modsim3.vim
@@ -0,0 +1,109 @@
+" Vim syntax file
+" Language:	Modsim III, by compuware corporation (www.compuware.com)
+" Maintainer:	Philipp Jocham <flip@sbox.tu-graz.ac.at>
+" Extension:	*.mod
+" Last Change:	2001 May 10
+"
+" 2001 March 24:
+"  - Modsim III is a registered trademark from compuware corporation
+"  - made compatible with Vim 6.0
+"
+" 1999 Apr 22 : Changed modsim3Literal from region to match
+"
+" very basic things only (based on the modula2 and c files).
+
+if version < 600
+  " Remove any old syntax stuff hanging around
+  syn clear
+elseif exists("b:current_syntax")
+  finish
+endif
+
+
+" syn case match " case sensitiv match is default
+
+" A bunch of keywords
+syn keyword modsim3Keyword ACTID ALL AND AS ASK
+syn keyword modsim3Keyword BY CALL CASE CLASS CONST DIV
+syn keyword modsim3Keyword DOWNTO DURATION ELSE ELSIF EXIT FALSE FIXED FOR
+syn keyword modsim3Keyword FOREACH FORWARD IF IN INHERITED INOUT
+syn keyword modsim3Keyword INTERRUPT LOOP
+syn keyword modsim3Keyword MOD MONITOR NEWVALUE
+syn keyword modsim3Keyword NONMODSIM NOT OBJECT OF ON OR ORIGINAL OTHERWISE OUT
+syn keyword modsim3Keyword OVERRIDE PRIVATE PROTO REPEAT
+syn keyword modsim3Keyword RETURN REVERSED SELF STRERR TELL
+syn keyword modsim3Keyword TERMINATE THISMETHOD TO TRUE TYPE UNTIL VALUE VAR
+syn keyword modsim3Keyword WAIT WAITFOR WHEN WHILE WITH
+
+" Builtin functions and procedures
+syn keyword modsim3Builtin ABS ACTIVATE ADDMONITOR CAP CHARTOSTR CHR CLONE
+syn keyword modsim3Builtin DEACTIVATE DEC DISPOSE FLOAT GETMONITOR HIGH INC
+syn keyword modsim3Builtin INPUT INSERT INTTOSTR ISANCESTOR LOW LOWER MAX MAXOF
+syn keyword modsim3Builtin MIN MINOF NEW OBJTYPEID OBJTYPENAME OBJVARID ODD
+syn keyword modsim3Builtin ONERROR ONEXIT ORD OUTPUT POSITION PRINT REALTOSTR
+syn keyword modsim3Builtin REPLACE REMOVEMONITOR ROUND SCHAR SIZEOF SPRINT
+syn keyword modsim3Builtin STRLEN STRTOCHAR STRTOINT STRTOREAL SUBSTR TRUNC
+syn keyword modsim3Builtin UPDATEVALUE UPPER VAL
+
+syn keyword modsim3BuiltinNoParen HALT TRACE
+
+" Special keywords
+syn keyword modsim3Block PROCEDURE METHOD MODULE MAIN DEFINITION IMPLEMENTATION
+syn keyword modsim3Block BEGIN END
+
+syn keyword modsim3Include IMPORT FROM
+
+syn keyword modsim3Type ANYARRAY ANYOBJ ANYREC ARRAY BOOLEAN CHAR INTEGER
+syn keyword modsim3Type LMONITORED LRMONITORED NILARRAY NILOBJ NILREC REAL
+syn keyword modsim3Type RECORD RMONITOR RMONITORED STRING
+
+" catch errros cause by wrong parenthesis
+" slight problem with "( *)" or "(* )". Hints?
+syn region modsim3Paren	transparent start='(' end=')' contains=ALLBUT,modsim3ParenError
+syn match modsim3ParenError ")"
+
+" Comments
+syn region modsim3Comment1 start="{" end="}" contains=modsim3Comment1,modsim3Comment2
+syn region modsim3Comment2 start="(\*" end="\*)" contains=modsim3Comment1,modsim3Comment2
+" highlighting is wrong for constructs like "{  (*  }  *)",
+" which are allowed in Modsim III, but
+" I think something like that shouldn't be used anyway.
+
+" Strings
+syn region modsim3String start=+"+ end=+"+
+
+" Literals
+"syn region modsim3Literal start=+'+ end=+'+
+syn match modsim3Literal "'[^']'\|''''"
+
+" 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_modsim3_syntax_inits")
+  if version < 508
+    let did_modsim3_syntax_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+  " The default methods for highlighting.  Can be overridden later
+  HiLink modsim3Keyword	Statement
+  HiLink modsim3Block		Statement
+  HiLink modsim3Comment1	Comment
+  HiLink modsim3Comment2	Comment
+  HiLink modsim3String		String
+  HiLink modsim3Literal	Character
+  HiLink modsim3Include	Statement
+  HiLink modsim3Type		Type
+  HiLink modsim3ParenError	Error
+  HiLink modsim3Builtin	Function
+  HiLink modsim3BuiltinNoParen	Function
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "modsim3"
+
+" vim: ts=8 sw=2
+