diff --git a/components/ILIAS/Filesystem/src/Util/Archive/Zip.php b/components/ILIAS/Filesystem/src/Util/Archive/Zip.php
index 173f94ea7930..6f22748305ba 100755
--- a/components/ILIAS/Filesystem/src/Util/Archive/Zip.php
+++ b/components/ILIAS/Filesystem/src/Util/Archive/Zip.php
@@ -38,6 +38,8 @@ class Zip
     private int $store_counter = 1;
     private int $path_counter = 1;
 
+    private bool $zip_opened = false;
+
     /**
      * @var FileStream[]
      */
@@ -70,7 +72,16 @@ public function __construct(
         if (!file_exists($this->zip_output_file)) {
             touch($this->zip_output_file);
         }
-        if ($this->zip->open($this->zip_output_file, \ZipArchive::OVERWRITE) !== true) {
+
+        $this->maybeOpenZip(\ZipArchive::OVERWRITE);
+    }
+
+    private function maybeOpenZip(?int $flags = null): void
+    {
+        if (!$this->zip_opened) {
+            $this->zip_opened = $this->zip->open($this->zip_output_file, $flags) === true;
+        }
+        if (!$this->zip_opened) {
             throw new \Exception("cannot open <$this->zip_output_file>\n");
         }
     }
@@ -99,7 +110,7 @@ private function storeZIPtoFilesystem(): void
         foreach ($this->streams as $path_inside_zip => $stream) {
             $path = $stream->getMetadata('uri');
             if ($this->store_counter === 0) {
-                $this->zip->open($this->zip_output_file);
+                $this->maybeOpenZip();
             }
             if (is_int($path_inside_zip)) {
                 $path_inside_zip = basename((string) $path);
@@ -120,6 +131,7 @@ private function storeZIPtoFilesystem(): void
                 || count(get_resources('stream')) > ($this->iteration_limit * 0.9)
             ) {
                 $this->zip->close();
+                $this->zip_opened = false;
                 $this->store_counter = 0;
             } else {
                 $this->store_counter++;
@@ -132,6 +144,7 @@ public function get(): Stream
         $this->storeZIPtoFilesystem();
 
         $this->zip->close();
+        $this->zip_opened = false;
 
         return Streams::ofResource(fopen($this->zip_output_file, 'rb'));
     }
@@ -156,7 +169,9 @@ public function destroy(): void
      */
     public function addPath(string $path, ?string $path_inside_zip = null): void
     {
-        $path_inside_zip = $path_inside_zip ?? basename($path);
+        $path_inside_zip ??= basename($path);
+
+        $this->maybeOpenZip();
 
         // create directory if it does not exist
         $this->zip->addEmptyDir(rtrim(dirname($path_inside_zip), '/') . '/');
@@ -225,7 +240,7 @@ public function addDirectory(string $directory_to_zip): void
             /** @var $file \SplFileInfo */
             if ($file->isDir()) {
                 // add directory to zip if it's empty
-                $sub_items = array_filter(scandir($pathname), static fn($d): bool => !str_contains((string) $d, '.DS_Store'));
+                $sub_items = array_filter(scandir($pathname), static fn($d): bool => !str_contains($d, '.DS_Store'));
                 if (count($sub_items) === 2) {
                     $this->zip->addEmptyDir($path_inside_zip);
                 }