diff --git a/u17/.classpath b/u17/.classpath
new file mode 100644
index 0000000..57bca72
--- /dev/null
+++ b/u17/.classpath
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>
diff --git a/u17/.gitignore b/u17/.gitignore
new file mode 100644
index 0000000..ae3c172
--- /dev/null
+++ b/u17/.gitignore
@@ -0,0 +1 @@
+/bin/
diff --git a/u17/.project b/u17/.project
new file mode 100644
index 0000000..cab8738
--- /dev/null
+++ b/u17/.project
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>u17</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/u17/.settings/org.eclipse.jdt.core.prefs b/u17/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..8c9943d
--- /dev/null
+++ b/u17/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,14 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=17
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=17
diff --git a/u17/src/DetectZip.java b/u17/src/DetectZip.java
new file mode 100644
index 0000000..7f75800
--- /dev/null
+++ b/u17/src/DetectZip.java
@@ -0,0 +1,54 @@
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+/**
+ * Klasse um zip Dateien zu erkennen
+ * @author p8q-yhw-u1
+ *
+ */
+public class DetectZip {
+    public static void main(String[] args) {
+        if (args.length != 1) {
+            error();
+            return;
+        }
+        
+        try {
+            FileInputStream f = new FileInputStream(new File(args[0]));
+            
+            byte[] zipBytes = {0x50, 0x4B};
+            
+            byte[] fileBytes = new byte[zipBytes.length];
+            
+            f.read(fileBytes, 0, zipBytes.length);
+            
+            for (int i = 0; i < zipBytes.length; i++) {
+                if (zipBytes[i] != fileBytes[i]) {
+                    System.out.println("no zip");
+                    return;
+                }
+            }
+            
+            System.out.println("zip");
+            return;
+            
+        } catch (FileNotFoundException e) {
+            error();
+            return;
+        } catch (IOException e) {
+            error();
+            return;
+        }
+    }
+    
+    /**
+     * Gibt eine Fehlermeldung aus
+     * Redundanzvermeidung
+     */
+    public static void error() {
+        System.out.println("error");
+        // System.exit(1) - nicht möglich wegen Graja, deswegen: error(); return;
+    }
+}