diff --git a/src/main/java/rife/bld/extension/CompileKotlinOperation.java b/src/main/java/rife/bld/extension/CompileKotlinOperation.java
index 1aeb930..d62b328 100644
--- a/src/main/java/rife/bld/extension/CompileKotlinOperation.java
+++ b/src/main/java/rife/bld/extension/CompileKotlinOperation.java
@@ -42,7 +42,7 @@ public class CompileKotlinOperation extends AbstractOperation<CompileKotlinOpera
     private static final Logger LOGGER = Logger.getLogger(CompileKotlinOperation.class.getName());
     private static final String OS_NAME =
             System.getProperty("os.name") != null ? System.getProperty("os.name").toLowerCase(Locale.US) : null;
-    private static final String KOTLINC_EXECUTABLE = "kotlinc" + (isWindows() && !isCygwin() && !isMinGW() ? ".bat" : "");
+    private static final String KOTLINC_EXECUTABLE = "kotlinc" + (isWindows() ? ".bat" : "");
     private final Collection<String> compileMainClasspath_ = new ArrayList<>();
     private final Collection<String> compileTestClasspath_ = new ArrayList<>();
     private final JvmOptions jvmOptions_ = new JvmOptions();
@@ -191,17 +191,6 @@ public class CompileKotlinOperation extends AbstractOperation<CompileKotlinOpera
         return KOTLINC_EXECUTABLE;
     }
 
-    /**
-     * Determines if the current runtime environment is Cygwin.
-     *
-     * @return {@code true} if the current runtime environment is Cygwin, {@code false} otherwise.
-     * @since 1.1.0
-     */
-    public static boolean isCygwin() {
-        var path = System.getenv("ORIGINAL_PATH");
-        return path != null && path.contains("/cygdrive/");
-    }
-
     private static boolean isExecutable(File file) {
         return file != null && file.exists() && file.isFile() && file.canExecute();
     }
@@ -226,17 +215,6 @@ public class CompileKotlinOperation extends AbstractOperation<CompileKotlinOpera
         return OS_NAME != null && (OS_NAME.contains("mac") || OS_NAME.contains("darwin") || OS_NAME.contains("osx"));
     }
 
-    /**
-     * Determines if the current runtime environment is MinGW.
-     *
-     * @return {@code true} if the current runtime environment is MinGW, {@code false} otherwise.
-     * @since 1.1.0
-     */
-    public static boolean isMinGW() {
-        var msys = System.getenv("MSYSTEM");
-        return msys != null && (msys.startsWith("MINGW") || msys.startsWith("MSYS"));
-    }
-
     /**
      * Determines if the given string is not blank.
      *