diff --git a/scripts/mk_def_file.py b/scripts/mk_def_file.py
index 2b9b5a071..07418a975 100755
--- a/scripts/mk_def_file.py
+++ b/scripts/mk_def_file.py
@@ -6,31 +6,31 @@ exported symbols of a dll. This file
 can be passed to the ``/DEF`` to the
 linker used by MSVC.
 """
-import mk_util
+import mk_genfile_common
 import argparse
 import logging
 import os
 import sys
 
 def main(args):
-  logging.basicConfig(level=logging.INFO)
-  parser = argparse.ArgumentParser(description=__doc__)
-  parser.add_argument("output_file", help="output def file path")
-  parser.add_argument("dllname", help="dllname to use in def file")
-  parser.add_argument("api_files", nargs="+")
-  pargs = parser.parse_args(args)
+    logging.basicConfig(level=logging.INFO)
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("output_file", help="output def file path")
+    parser.add_argument("dllname", help="dllname to use in def file")
+    parser.add_argument("api_files", nargs="+")
+    pargs = parser.parse_args(args)
 
-  for api_file in pargs.api_files:
-    if not os.path.exists(api_file):
-      logging.error('"{}" does not exist'.format(api_file))
-      return 1
+    if not mk_genfile_common.check_files_exist(pargs.api_files):
+        logging.error('One or more api files do not exist')
+        return 1
 
-  mk_util.mk_def_file_internal(
-    pargs.output_file,
-    pargs.dllname,
-    pargs.api_files)
-  return 0
+    mk_genfile_common.mk_def_file_internal(
+        pargs.output_file,
+        pargs.dllname,
+        pargs.api_files)
+    logging.info('Generated "{}"'.format(pargs.output_file))
+    return 0
 
 if __name__ == '__main__':
-  sys.exit(main(sys.argv[1:]))
+    sys.exit(main(sys.argv[1:]))
 
diff --git a/scripts/mk_genfile_common.py b/scripts/mk_genfile_common.py
index abe10a0d1..e0b9bce48 100644
--- a/scripts/mk_genfile_common.py
+++ b/scripts/mk_genfile_common.py
@@ -124,3 +124,36 @@ def mk_z3consts_py_internal(api_files, output_dir):
         api.close()
     z3consts.close()
     return z3consts_output_path
+
+###############################################################################
+# Functions for generating a "module definition file" for MSVC
+###############################################################################
+
+def mk_def_file_internal(defname, dll_name, export_header_files):
+    """
+      Writes to a module definition file to a file named ``defname``.
+
+      ``dll_name`` is the name of the dll (without the ``.dll`` suffix).
+      ``export_header_file`` is a list of header files to scan for symbols
+      to include in the module definition file.
+    """
+    assert isinstance(export_header_files, list)
+    pat1 = re.compile(".*Z3_API.*")
+    fout = open(defname, 'w')
+    fout.write('LIBRARY "%s"\nEXPORTS\n' % dll_name)
+    num = 1
+    for export_header_file in export_header_files:
+        api = open(export_header_file, 'r')
+        for line in api:
+            m = pat1.match(line)
+            if m:
+                words = re.split('\W+', line)
+                i = 0
+                for w in words:
+                    if w == 'Z3_API':
+                        f = words[i+1]
+                        fout.write('\t%s @%s\n' % (f, num))
+                    i = i + 1
+                num = num + 1
+        api.close()
+    fout.close()
diff --git a/scripts/mk_util.py b/scripts/mk_util.py
index da3c6eef9..f9d639daf 100644
--- a/scripts/mk_util.py
+++ b/scripts/mk_util.py
@@ -2913,28 +2913,7 @@ def mk_def_file(c):
         dot_h_c = c.find_file(dot_h, c.name)
         api = os.path.join(dot_h_c.src_dir, dot_h)
         export_header_files.append(api)
-    mk_def_file_internal(defname, dll_name, export_header_files)
-
-def mk_def_file_internal(defname, dll_name, export_header_files):
-    pat1 = re.compile(".*Z3_API.*")
-    fout = open(defname, 'w')
-    fout.write('LIBRARY "%s"\nEXPORTS\n' % dll_name)
-    num = 1
-    for export_header_file in export_header_files:
-        api = open(export_header_file, 'r')
-        for line in api:
-            m = pat1.match(line)
-            if m:
-                words = re.split('\W+', line)
-                i = 0
-                for w in words:
-                    if w == 'Z3_API':
-                        f = words[i+1]
-                        fout.write('\t%s @%s\n' % (f, num))
-                    i = i + 1
-                num = num + 1
-        api.close()
-    fout.close()
+    mk_genfile_common.mk_def_file_internal(defname, dll_name, export_header_files)
     if VERBOSE:
         print("Generated '%s'" % defname)