diff --git a/Command/DumpCompletionCommand.php b/Command/DumpCompletionCommand.php
index 6a322c929..10280f73a 100644
--- a/Command/DumpCompletionCommand.php
+++ b/Command/DumpCompletionCommand.php
@@ -48,7 +48,7 @@ protected function configure()
         $shell = $this->guessShell();
         [$rcFile, $completionFile] = match ($shell) {
             'fish' => ['~/.config/fish/config.fish', "/etc/fish/completions/$commandName.fish"],
-            'zsh' => ['~/.zshrc', '$fpath[1]/'.$commandName],
+            'zsh' => ['~/.zshrc', '$fpath[1]/_'.$commandName],
             default => ['~/.bashrc', "/etc/bash_completion.d/$commandName"],
         };
 
@@ -143,8 +143,19 @@ private function tailDebugLog(string $commandName, OutputInterface $output): voi
      */
     private function getSupportedShells(): array
     {
-        return $this->supportedShells ??= array_map(function ($f) {
-            return pathinfo($f, \PATHINFO_EXTENSION);
-        }, glob(__DIR__.'/../Resources/completion.*'));
+        if (isset($this->supportedShells)) {
+            return $this->supportedShells;
+        }
+
+        $shells = [];
+
+        foreach (new \DirectoryIterator(__DIR__.'/../Resources/') as $file) {
+            if (str_starts_with($file->getBasename(), 'completion.') && $file->isFile()) {
+                $shells[] = $file->getExtension();
+            }
+        }
+        sort($shells);
+
+        return $this->supportedShells = $shells;
     }
 }
diff --git a/Helper/Table.php b/Helper/Table.php
index 893b3192e..907c9f505 100644
--- a/Helper/Table.php
+++ b/Helper/Table.php
@@ -804,7 +804,7 @@ private function calculateColumnsWidth(iterable $groups)
                             $textContent = Helper::removeDecoration($this->output->getFormatter(), $cell);
                             $textLength = Helper::width($textContent);
                             if ($textLength > 0) {
-                                $contentColumns = str_split($textContent, ceil($textLength / $cell->getColspan()));
+                                $contentColumns = mb_str_split($textContent, ceil($textLength / $cell->getColspan()));
                                 foreach ($contentColumns as $position => $content) {
                                     $row[$i + $position] = $content;
                                 }
diff --git a/Resources/completion.zsh b/Resources/completion.zsh
index 97a9e88cd..ff76fe5fa 100644
--- a/Resources/completion.zsh
+++ b/Resources/completion.zsh
@@ -1,3 +1,5 @@
+#compdef {{ COMMAND_NAME }}
+
 # This file is part of the Symfony package.
 #
 # (c) Fabien Potencier <fabien@symfony.com>
diff --git a/Terminal.php b/Terminal.php
index 216c609fa..7d10b13ad 100644
--- a/Terminal.php
+++ b/Terminal.php
@@ -136,7 +136,8 @@ public static function hasSttyAvailable(): bool
     private static function initDimensions()
     {
         if ('\\' === \DIRECTORY_SEPARATOR) {
-            if (preg_match('/^(\d+)x(\d+)(?: \((\d+)x(\d+)\))?$/', trim(getenv('ANSICON')), $matches)) {
+            $ansicon = getenv('ANSICON');
+            if (false !== $ansicon && preg_match('/^(\d+)x(\d+)(?: \((\d+)x(\d+)\))?$/', trim($ansicon), $matches)) {
                 // extract [w, H] from "wxh (WxH)"
                 // or [w, h] from "wxh"
                 self::$width = (int) $matches[1];
@@ -216,6 +217,8 @@ private static function readFromProcess(string|array $command): ?string
             2 => ['pipe', 'w'],
         ];
 
+        $cp = \function_exists('sapi_windows_cp_set') ? sapi_windows_cp_get() : 0;
+
         $process = proc_open($command, $descriptorspec, $pipes, null, null, ['suppress_errors' => true]);
         if (!\is_resource($process)) {
             return null;
@@ -226,6 +229,10 @@ private static function readFromProcess(string|array $command): ?string
         fclose($pipes[2]);
         proc_close($process);
 
+        if ($cp) {
+            sapi_windows_cp_set($cp);
+        }
+
         return $info;
     }
 }
diff --git a/Tests/Helper/TableTest.php b/Tests/Helper/TableTest.php
index 8efaa72f5..5908c5b97 100644
--- a/Tests/Helper/TableTest.php
+++ b/Tests/Helper/TableTest.php
@@ -316,7 +316,7 @@ public static function renderProvider()
                     ],
                     new TableSeparator(),
                     [
-                        new TableCell('Cupiditate dicta atque porro, tempora exercitationem modi animi nulla nemo vel nihil!', ['colspan' => 3]),
+                        new TableCell('Cupìdĭtâte díctá âtquè pôrrò, tèmpórà exercitátìónèm mòdí ânìmí núllà nèmò vèl níhìl!', ['colspan' => 3]),
                     ],
                 ],
                 'default',
@@ -333,7 +333,7 @@ public static function renderProvider()
 | 9971-5-0210-0                 | A Tale of                                                   |
 |                               | Two Cities                                                  |
 +-------------------------------+-------------------------------+-----------------------------+
-| Cupiditate dicta atque porro, tempora exercitationem modi animi nulla nemo vel nihil!       |
+| Cupìdĭtâte díctá âtquè pôrrò, tèmpórà exercitátìónèm mòdí ânìmí núllà nèmò vèl níhìl!       |
 +-------------------------------+-------------------------------+-----------------------------+
 
 TABLE