3 files changed, 5 insertions, 9 deletions
diff --git a/modules/mono/build_scripts/mono_configure.py b/modules/mono/build_scripts/mono_configure.py
index 3e771e06f0..e959312393 100644
--- a/modules/mono/build_scripts/mono_configure.py
+++ b/modules/mono/build_scripts/mono_configure.py
@@ -1,6 +1,5 @@
 import os
 import os.path
-import sys
 import subprocess
 
 from SCons.Script import Dir, Environment
diff --git a/modules/mono/build_scripts/mono_reg_utils.py b/modules/mono/build_scripts/mono_reg_utils.py
index 3090a4759a..0ec7e2f433 100644
--- a/modules/mono/build_scripts/mono_reg_utils.py
+++ b/modules/mono/build_scripts/mono_reg_utils.py
@@ -9,7 +9,7 @@ if os.name == "nt":
 def _reg_open_key(key, subkey):
     try:
         return winreg.OpenKey(key, subkey)
-    except (WindowsError, OSError):
+    except OSError:
         if platform.architecture()[0] == "32bit":
             bitness_sam = winreg.KEY_WOW64_64KEY
         else:
@@ -37,7 +37,7 @@ def _find_mono_in_reg(subkey, bits):
         with _reg_open_key_bits(winreg.HKEY_LOCAL_MACHINE, subkey, bits) as hKey:
             value = winreg.QueryValueEx(hKey, "SdkInstallRoot")[0]
             return value
-    except (WindowsError, OSError):
+    except OSError:
         return None
 
 
@@ -48,7 +48,7 @@ def _find_mono_in_reg_old(subkey, bits):
             if default_clr:
                 return _find_mono_in_reg(subkey + "\\" + default_clr, bits)
             return None
-    except (WindowsError, EnvironmentError):
+    except OSError:
         return None
 
 
@@ -97,7 +97,7 @@ def find_msbuild_tools_path_reg():
         raise ValueError("Cannot find `installationPath` entry")
     except ValueError as e:
         print("Error reading output from vswhere: " + e.message)
-    except WindowsError:
+    except OSError:
         pass  # Fine, vswhere not found
     except (subprocess.CalledProcessError, OSError):
         pass
@@ -109,5 +109,5 @@ def find_msbuild_tools_path_reg():
         with _reg_open_key(winreg.HKEY_LOCAL_MACHINE, subkey) as hKey:
             value = winreg.QueryValueEx(hKey, "MSBuildToolsPath")[0]
             return value
-    except (WindowsError, OSError):
+    except OSError:
         return ""
diff --git a/modules/mono/build_scripts/solution_builder.py b/modules/mono/build_scripts/solution_builder.py
index 03f4e57f02..6a621c3c8b 100644
--- a/modules/mono/build_scripts/solution_builder.py
+++ b/modules/mono/build_scripts/solution_builder.py
@@ -8,9 +8,6 @@ def find_dotnet_cli():
     import os.path
 
     if os.name == "nt":
-        windows_exts = os.environ["PATHEXT"]
-        windows_exts = windows_exts.split(os.pathsep) if windows_exts else []
-
         for hint_dir in os.environ["PATH"].split(os.pathsep):
             hint_dir = hint_dir.strip('"')
             hint_path = os.path.join(hint_dir, "dotnet")