diff --git a/openapi-codegen/src/main/java/com/axonivy/ivy/tool/openapi/codegen/mojo/OpenApiClientGeneratorMojo.java b/openapi-codegen/src/main/java/com/axonivy/ivy/tool/openapi/codegen/mojo/OpenApiClientGeneratorMojo.java
index 3b6b1f0..dd16754 100644
--- a/openapi-codegen/src/main/java/com/axonivy/ivy/tool/openapi/codegen/mojo/OpenApiClientGeneratorMojo.java
+++ b/openapi-codegen/src/main/java/com/axonivy/ivy/tool/openapi/codegen/mojo/OpenApiClientGeneratorMojo.java
@@ -94,8 +94,8 @@ private ParseResult parseOpenAPI() throws MojoExecutionException {
   }
 
   static URL specResource(String openApiSpec) {
-    var res = URI.create(openApiSpec);
     try {
+      var res = URI.create(openApiSpec);
       return res.toURL();
     } catch (Exception ex) {
       var pathUri = Optional.ofNullable(openApiSpec)
diff --git a/openapi-codegen/src/test/java/com/axonivy/ivy/tool/openapi/codegen/mojo/TestOpenApiClientGeneratorMojo.java b/openapi-codegen/src/test/java/com/axonivy/ivy/tool/openapi/codegen/mojo/TestOpenApiClientGeneratorMojo.java
index 96ffec7..7827624 100644
--- a/openapi-codegen/src/test/java/com/axonivy/ivy/tool/openapi/codegen/mojo/TestOpenApiClientGeneratorMojo.java
+++ b/openapi-codegen/src/test/java/com/axonivy/ivy/tool/openapi/codegen/mojo/TestOpenApiClientGeneratorMojo.java
@@ -1,6 +1,7 @@
 package com.axonivy.ivy.tool.openapi.codegen.mojo;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import java.net.URI;
 import java.nio.file.Files;
@@ -83,4 +84,10 @@ void openApiSpec_asPath() throws Exception {
         .isEqualTo(uri);
   }
 
+  @Test
+  void openApiSpec_asUri_windows() throws Exception {
+    String winUri = "C:\\Users\\ReguelWermelingerAxo\\dev\\demo-projects\\connectivity\\connectivity-demos/src/io/swagger/petstore3/client/openapi.json";
+    assertThatThrownBy(() -> OpenApiClientGeneratorMojo.specResource(winUri));
+  }
+
 }