implement double click open for zip files

resources/bundles/org.eclipse.core.resources/plugin.properties

@@ -26,6 +26,7 @@ filterMatchers=Filter Matchers
 preferencesExtPtName=Resource Preferences
 resourceModelName=File System Resources
 variableProviders=Variable Providers
+zipfileContentTypeName = Zip File
 
 markerName = Marker
 problemName = Problem

resources/bundles/org.eclipse.core.resources/plugin.xml

@@ -41,6 +41,15 @@
 			id="preferences"
 			base-type="org.eclipse.core.runtime.properties"/>		
 	</extension>
+
+	<extension point="org.eclipse.core.contenttype.contentTypes">
+		<file-association content-type="zipfile" file-extensions="zip, jar, war"/>
+		<content-type
+            id="archive"
+            describer="org.eclipse.core.runtime.content.ZipFileContentDescriber"
+            name="%zipfileContentTypeName"
+            priority="normal"/>
+	</extension>
 
    <extension
          id="marker"

runtime/bundles/org.eclipse.core.contenttype/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.core.contenttype; singleton:=true
-Bundle-Version: 3.9.500.qualifier
+Bundle-Version: 3.10.0.qualifier
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
 Require-Bundle: org.eclipse.equinox.preferences;bundle-version="[3.2.0,4.0.0)",

runtime/bundles/org.eclipse.core.contenttype/src/org/eclipse/core/runtime/content/ZipFileContentDescriber.java

@@ -0,0 +1,36 @@
+/*******************************************************************************
+ * Copyright (c) 2024 Vector Informatik GmbH and others.
+ *
+ * This program and the accompanying materials are made available under the terms of the Eclipse
+ * Public License 2.0 which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors: Vector Informatik GmbH - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.core.runtime.content;
+
+import java.io.IOException;
+import java.io.InputStream;
+import org.eclipse.core.internal.content.TextContentDescriber;
+
+/**
+ * @since 3.10
+ *
+ */
+public class ZipFileContentDescriber extends TextContentDescriber {
+
+	@Override
+	public int describe(InputStream contents, IContentDescription description) throws IOException {
+
+		IContentType type = description.getContentType();
+		if (type == null || description == null)
+			return VALID;
+
+		if (type.getId().equals("zipfile")) { //$NON-NLS-1$
+			return VALID;
+		}
+		return INVALID;
+	}
+}