diff --git a/giscanner/dumper.py b/giscanner/dumper.py
index d95ea6b..84a7afc 100644
--- a/giscanner/dumper.py
+++ b/giscanner/dumper.py
@@ -157,8 +157,9 @@ class DumpCompiler(object):
         else:
             o_path = self._generate_tempfile(tmpdir, '.o')
 
+        os.name = 'nt'
         if os.name == 'nt':
-            ext = 'exe'
+            ext = '.exe'
         else:
             ext = ''
 
@@ -257,10 +258,7 @@ class DumpCompiler(object):
         else:
             args.extend(['-o', output])
         if libtool:
-            if os.name == 'nt':
-                args.append('-export-all-symbols')
-            else:
-                args.append('-export-dynamic')
+            args.append('-export-dynamic')
 
         cflags = os.environ.get('CFLAGS', '')
         for cflag in cflags.split():
@@ -354,6 +352,8 @@ class DumpCompiler(object):
             if self._pkgconfig_msvc_flags == '':
                 if library.endswith(".la"): # explicitly specified libtool library
                     args.append(library)
+                elif library.startswith("lib") and library.endswith("-0"):
+                    args.append('-l' + library[3:-2])
                 else:
                     args.append('-l' + library)