diff --git a/.github/workflows/bld.yml b/.github/workflows/bld.yml
index 138f5e5..6966bcb 100644
--- a/.github/workflows/bld.yml
+++ b/.github/workflows/bld.yml
@@ -1,14 +1,16 @@
 name: bld-ci
 
-on: [push, pull_request, workflow_dispatch]
+on: [ push, pull_request, workflow_dispatch ]
 
 jobs:
   build-bld-project:
-    runs-on: ubuntu-latest
-
     strategy:
       matrix:
-        java-version: [17, 21, 24]
+        java-version: [ 17, 21, 24 ]
+        kotlin-version: [ 1.9.25, 2.0.21, 2.1.20 ]
+        os: [ ubuntu-latest, windows-latest, macos-latest ]
+
+    runs-on: ${{ matrix.os }}
 
     steps:
       - name: Checkout source repository
@@ -22,8 +24,16 @@ jobs:
           distribution: "zulu"
           java-version: ${{ matrix.java-version }}
 
+      - name: Download dependencies [examples]
+        working-directory: examples
+        run: ./bld download
+
+      - name: Compile and Run Checkstyle [examples]
+        working-directory: examples
+        run: ./bld compile checkstyle-custom
+
       - name: Download dependencies
         run: ./bld download
 
       - name: Run tests
-        run: ./bld compile test
+        run: ./bld compile test
\ No newline at end of file
diff --git a/examples/lib/bld/bld-wrapper.properties b/examples/lib/bld/bld-wrapper.properties
index 715835e..84fb734 100644
--- a/examples/lib/bld/bld-wrapper.properties
+++ b/examples/lib/bld/bld-wrapper.properties
@@ -1,7 +1,7 @@
 bld.downloadExtensionJavadoc=false
 bld.downloadExtensionSources=true
 bld.downloadLocation=
-bld.extension-checkstyle=com.uwyn.rife2:bld-checkstyle:1.0.13
+bld.extension-checkstyle=com.uwyn.rife2:bld-checkstyle:1.0.14-SNAPSHOT
 bld.repositories=MAVEN_LOCAL,MAVEN_CENTRAL,RIFE2_SNAPSHOTS,RIFE2_RELEASES
 bld.sourceDirectories=
 bld.version=2.2.1
diff --git a/examples/src/bld/java/com/example/ExamplesBuild.java b/examples/src/bld/java/com/example/ExamplesBuild.java
index ea28912..d49b966 100644
--- a/examples/src/bld/java/com/example/ExamplesBuild.java
+++ b/examples/src/bld/java/com/example/ExamplesBuild.java
@@ -5,6 +5,9 @@ import rife.bld.BuildCommand;
 import rife.bld.extension.CheckstyleOperation;
 
 import java.util.List;
+import java.util.logging.ConsoleHandler;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import static rife.bld.dependencies.Repository.MAVEN_CENTRAL;
 import static rife.bld.dependencies.Scope.*;
@@ -29,10 +32,20 @@ public class ExamplesBuild extends BaseProject {
     }
 
     public static void main(String[] args) {
+        // Enable detailed logging for the extensions
+        var level = Level.ALL;
+        var logger = Logger.getLogger("rife.bld.extension");
+        var consoleHandler = new ConsoleHandler();
+
+        consoleHandler.setLevel(level);
+        logger.addHandler(consoleHandler);
+        logger.setLevel(level);
+        logger.setUseParentHandlers(false);
+
         new ExamplesBuild().start(args);
     }
 
-    @BuildCommand(summary = "Check code style")
+    @BuildCommand(summary = "Check code style using Sun coding conventions")
     public void checkstyle() throws Exception {
         new CheckstyleOperation()
                 .fromProject(this)
@@ -40,4 +53,11 @@ public class ExamplesBuild extends BaseProject {
                 .execute();
     }
 
+    @BuildCommand(value = "checkstyle-custom", summary = "Check code style using custom coding conventions")
+    public void checkstyleCustom() throws Exception {
+        new CheckstyleOperation()
+                .fromProject(this)
+                .configurationFile("src/test/resources/checkstyle.xml")
+                .execute();
+    }
 }
diff --git a/examples/src/test/resources/checkstyle.xml b/examples/src/test/resources/checkstyle.xml
new file mode 100644
index 0000000..e601ecb
--- /dev/null
+++ b/examples/src/test/resources/checkstyle.xml
@@ -0,0 +1,10 @@
+<!DOCTYPE module PUBLIC
+  "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
+  "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
+<module name="Checker">
+    <module name="TreeWalker">
+        <module name="AvoidStarImport">
+            <property name="severity" value="warning" />
+        </module>
+    </module>
+</module>
\ No newline at end of file
diff --git a/src/bld/java/rife/bld/extension/CheckstyleOperationBuild.java b/src/bld/java/rife/bld/extension/CheckstyleOperationBuild.java
index c7cf95c..90f78c6 100644
--- a/src/bld/java/rife/bld/extension/CheckstyleOperationBuild.java
+++ b/src/bld/java/rife/bld/extension/CheckstyleOperationBuild.java
@@ -23,6 +23,7 @@ import rife.bld.publish.PublishLicense;
 import rife.bld.publish.PublishScm;
 
 import java.util.List;
+import java.util.Locale;
 
 import static rife.bld.dependencies.Repository.*;
 import static rife.bld.dependencies.Scope.compile;
@@ -99,10 +100,13 @@ public class CheckstyleOperationBuild extends Project {
 
     @Override
     public void test() throws Exception {
-        new ExecOperation()
-                .fromProject(this)
-                .command("scripts/cliargs.sh")
-                .execute();
+        var os = System.getProperty("os.name");
+        if (os != null && os.toLowerCase(Locale.US).contains("linux")) {
+            new ExecOperation()
+                    .fromProject(this)
+                    .command("scripts/cliargs.sh")
+                    .execute();
+        }
         super.test();
     }
 }
diff --git a/src/main/java/rife/bld/extension/CheckstyleOperation.java b/src/main/java/rife/bld/extension/CheckstyleOperation.java
index d9b7b52..97eeb55 100644
--- a/src/main/java/rife/bld/extension/CheckstyleOperation.java
+++ b/src/main/java/rife/bld/extension/CheckstyleOperation.java
@@ -235,9 +235,9 @@ public class CheckstyleOperation extends AbstractProcessOperation<CheckstyleOper
             args.add(javaTool());
 
             args.add("-cp");
-            args.add(String.format("%s:%s:%s:%s", new File(project_.libTestDirectory(), "*"),
-                    new File(project_.libCompileDirectory(), "*"), project_.buildMainDirectory(),
-                    project_.buildTestDirectory()));
+            args.add(String.format("%s%s%s%s%s%s%s", new File(project_.libTestDirectory(), "*"),
+                    File.pathSeparator, new File(project_.libCompileDirectory(), "*"), File.pathSeparator,
+                    project_.buildMainDirectory(), File.pathSeparator, project_.buildTestDirectory()));
             args.add("com.puppycrawl.tools.checkstyle.Main");
 
             options_.forEach((k, v) -> {
@@ -250,7 +250,8 @@ public class CheckstyleOperation extends AbstractProcessOperation<CheckstyleOper
             if (!exclude_.isEmpty()) {
                 for (var e : exclude_) {
                     if (e.exists()) {
-                        args.add("-e " + e.getAbsolutePath());
+                        args.add("-e");
+                        args.add(e.getAbsolutePath());
                     }
                 }
             }
@@ -258,7 +259,8 @@ public class CheckstyleOperation extends AbstractProcessOperation<CheckstyleOper
             if (!excludeRegex_.isEmpty()) {
                 for (var e : excludeRegex_) {
                     if (isNotBlank(e)) {
-                        args.add("-x " + e);
+                        args.add("-x");
+                        args.add(e);
                     }
                 }
             }
diff --git a/src/test/java/rife/bld/extension/CheckstyleOperationTest.java b/src/test/java/rife/bld/extension/CheckstyleOperationTest.java
index b6f05c3..0d0e1b2 100644
--- a/src/test/java/rife/bld/extension/CheckstyleOperationTest.java
+++ b/src/test/java/rife/bld/extension/CheckstyleOperationTest.java
@@ -19,6 +19,8 @@ package rife.bld.extension;
 import org.assertj.core.api.AutoCloseableSoftAssertions;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledOnOs;
+import org.junit.jupiter.api.condition.OS;
 import rife.bld.BaseProject;
 import rife.bld.Project;
 import rife.bld.WebProject;
@@ -65,6 +67,7 @@ class CheckstyleOperationTest {
     }
 
     @Test
+    @EnabledOnOs(OS.LINUX)
     void checkAllParameters() throws IOException {
         var args = Files.readAllLines(Paths.get("src", "test", "resources", "checkstyle-args.txt"));
 
@@ -125,27 +128,27 @@ class CheckstyleOperationTest {
         var e = "-e ";
 
         var op = new CheckstyleOperation().fromProject(new Project()).exclude(SRC_MAIN_JAVA, SRC_TEST_JAVA);
-        assertThat(op.executeConstructProcessCommandList()).as("String...")
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("String...")
                 .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
 
         op = new CheckstyleOperation().fromProject(new Project()).excludeStrings(List.of(SRC_MAIN_JAVA, SRC_TEST_JAVA));
-        assertThat(op.executeConstructProcessCommandList()).as("List(String...)")
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("List(String...)")
                 .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
 
         op = new CheckstyleOperation().fromProject(new Project()).exclude(foo, bar);
-        assertThat(op.executeConstructProcessCommandList()).as("File...")
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("File...")
                 .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
 
         op = new CheckstyleOperation().fromProject(new Project()).exclude(List.of(foo, bar));
-        assertThat(op.executeConstructProcessCommandList()).as("List(File...)")
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("List(File...)")
                 .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
 
         op = new CheckstyleOperation().fromProject(new Project()).exclude(foo.toPath(), bar.toPath());
-        assertThat(op.executeConstructProcessCommandList()).as("Path...")
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("Path...")
                 .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
 
         op = new CheckstyleOperation().fromProject(new Project()).excludePaths(List.of(foo.toPath(), bar.toPath()));
-        assertThat(op.executeConstructProcessCommandList()).as("List(Path...)")
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("List(Path...)")
                 .contains(e + foo.getAbsolutePath()).contains(e + bar.getAbsolutePath());
     }
 
@@ -153,10 +156,10 @@ class CheckstyleOperationTest {
     void excludeRegex() {
         var op = new CheckstyleOperation().fromProject(new Project()).excludeRegex(FOO, BAR);
         var x = "-x ";
-        assertThat(op.executeConstructProcessCommandList()).contains(x + FOO, x + BAR);
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).contains(x + FOO, x + BAR);
 
         op = new CheckstyleOperation().fromProject(new Project()).excludeRegex(List.of(FOO, BAR));
-        assertThat(op.executeConstructProcessCommandList()).as("as list").contains(x + FOO, x + BAR);
+        assertThat(String.join(" ", op.executeConstructProcessCommandList())).as("as list").contains(x + FOO, x + BAR);
     }
 
     @Test