diff --git a/setup.py b/setup.py
index e879fb1..f0297b3 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@ README = (HERE / "README.md").read_text()
 
 setup(
     name='worthless',
-    version='1.3.0',
+    version='1.3.1',
     packages=['worthless', 'worthless.classes', 'worthless.classes.launcher', 'worthless.classes.installer'],
     url='https://git.froggi.es/tretrauit/worthless-launcher',
     license='MIT License',
diff --git a/worthless/installer.py b/worthless/installer.py
index 9bff2b2..6e141ca 100644
--- a/worthless/installer.py
+++ b/worthless/installer.py
@@ -95,7 +95,8 @@ class HDiffPatch:
         return None
 
     def get_hpatchz_executable(self):
-        return self._get_hdiffpatch_exec("hpatchz")
+        hpatchz_name = "hpatchz" + (".exe" if platform.system() == "Windows" else "")
+        return self._get_hdiffpatch_exec(hpatchz_name)
 
     async def patch_file(self, in_file, out_file, patch_file):
         hpatchz = self.get_hpatchz_executable()
@@ -104,7 +105,8 @@ class HDiffPatch:
         return await asyncio.create_subprocess_exec(hpatchz, "-f", in_file, patch_file, out_file)
 
     def get_hdiffz_executable(self):
-        return self._get_hdiffpatch_exec("hdiffz")
+        hdiffz_name = "hdiffz" + (".exe" if platform.system() == "Windows" else "")
+        return self._get_hdiffpatch_exec(hdiffz_name)
 
     async def _get_latest_release_info(self):
         async with aiohttp.ClientSession() as session: