Index: src/core/kprotocolmanager.h
===================================================================
--- src/core/kprotocolmanager.h
+++ src/core/kprotocolmanager.h
@@ -615,6 +615,19 @@
     static bool isSourceProtocol(const QUrl &url);
 
     /**
+     * Returns which protocols handle this mimetype, if it's an archive mimetype.
+     * For instance tar:/ handles application/x-tar,application/x-bzip-compressed-tar etc.
+     *
+     * This is defined in the protocol description file using an entry like
+     * "archiveMimetype=application/x-tar,application/x-bzip-compressed-tar"
+     *
+     * @param mimetype the mimetype to check
+     * @return the protocol that can handle this archive mimetype, for instance "zip".
+     * @since 5.22
+     */
+    static QList<QString> protocolsForArchiveMimetype(const QString &mimeType);
+
+    /**
      * Returns which protocol handles this mimetype, if it's an archive mimetype.
      * For instance zip:/ handles application/x-zip.
      *
Index: src/core/kprotocolmanager.cpp
===================================================================
--- src/core/kprotocolmanager.cpp
+++ src/core/kprotocolmanager.cpp
@@ -1301,7 +1301,7 @@
     return prot->m_defaultMimetype;
 }
 
-QString KProtocolManager::protocolForArchiveMimetype(const QString &mimeType)
+QList<QString> KProtocolManager::protocolsForArchiveMimetype(const QString &mimeType)
 {
     PRIVATE_DATA;
     QMutexLocker lock(&d->mutex);
@@ -1311,11 +1311,16 @@
                 it != allProtocols.end(); ++it) {
             const QStringList archiveMimetypes = (*it)->m_archiveMimeTypes;
             Q_FOREACH (const QString &mime, archiveMimetypes) {
-                d->protocolForArchiveMimetypes.insert(mime, (*it)->m_name);
+                d->protocolForArchiveMimetypes.insertMulti(mime, (*it)->m_name);
             }
         }
     }
-    return d->protocolForArchiveMimetypes.value(mimeType);
+    return d->protocolForArchiveMimetypes.values(mimeType);
+}
+
+QString KProtocolManager::protocolForArchiveMimetype(const QString &mimeType)
+{
+    return protocolsForArchiveMimetype(mimeType).value(0);
 }
 
 QString KProtocolManager::charsetFor(const QUrl &url)