diff --git a/.github/config-test.inc.php b/.github/config-test.inc.php
index 65c6f743b72..674ea5f0e8f 100644
--- a/.github/config-test.inc.php
+++ b/.github/config-test.inc.php
@@ -3,7 +3,7 @@
 $config = [];
 
 // Database configuration
-$config['db_dsnw'] = 'sqlite:////tmp/sqlite.db?mode=0646';
+$config['db_dsnw'] = 'sqlite:///' . sys_get_temp_dir() . '/roundcube-test-sqlite.db?mode=0646';
 
 // Test user credentials
 $config['tests_username'] = 'test';
diff --git a/.github/workflows/browser_tests.yml b/.github/workflows/browser_tests.yml
index 69c4a075307..9503b711d43 100644
--- a/.github/workflows/browser_tests.yml
+++ b/.github/workflows/browser_tests.yml
@@ -1,4 +1,4 @@
-name: browser_tests
+name: E2E
 
 on:
   push:
@@ -14,8 +14,10 @@ jobs:
 
     strategy:
       fail-fast: true
+      matrix:
+        php: ["8.1"]
 
-    name: Browser Tests
+    name: Linux / PHP ${{ matrix.php }}
 
     steps:
       - name: Checkout code
@@ -24,7 +26,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.1'
+          php-version: ${{ matrix.php }}
           extensions: dom, curl, fileinfo, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, gd, ldap, intl, pspell
           tools: composer:v2
           coverage: none
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index cb3884a1919..c5e02ef585e 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,4 +1,4 @@
-name: tests
+name: Unit
 
 on:
   push:
@@ -8,7 +8,7 @@ permissions:
   contents: read
 
 jobs:
-  linux_tests:
+  tests_linux:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[skip ci]') && !contains(github.event.head_commit.message, '[ci skip]')"
 
@@ -17,7 +17,7 @@ jobs:
       matrix:
         php: ["7.3", "7.4", "8.0", "8.1", "8.2", "8.3"]
 
-    name: PHP ${{ matrix.php }}/Linux
+    name: Linux / PHP ${{ matrix.php }}
 
     steps:
       - name: Checkout code
@@ -43,10 +43,6 @@ jobs:
             cp composer.json-dist composer.json
             composer require "kolab/net_ldap3:~1.1.1" --no-update
 
-      - name: Fix PHPUnit for PHP 8.2
-        run: composer config platform.php 8.1
-        if: matrix.php >= 8.2
-
       - name: Install dependencies
         run: composer install --prefer-dist --no-interaction --no-progress
 
@@ -62,3 +58,41 @@ jobs:
         with:
           name: Logs
           path: logs/errors.log
+
+  tests_windows:
+    runs-on: windows-latest
+    if: "!contains(github.event.head_commit.message, '[skip ci]') && !contains(github.event.head_commit.message, '[ci skip]')"
+
+    strategy:
+      fail-fast: true
+      matrix:
+        php: ["7.3", "7.4", "8.0", "8.1", "8.2", "8.3"]
+
+    name: Windows / PHP ${{ matrix.php }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: dom, curl, fileinfo, libxml, mbstring, zip, pdo, sqlite, pdo_sqlite, gd, ldap, intl
+          tools: composer:v2
+          coverage: none
+          ini-values: error_reporting=E_ALL
+
+      - name: Setup composer
+        run: |
+            cp composer.json-dist composer.json
+            composer require "kolab/net_ldap3:~1.1.1" --no-update
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-interaction --no-progress
+
+      - name: Roundcube configuration
+        run: cp .github/config-test.inc.php config/config-test.inc.php
+
+      - name: Execute tests
+        run: vendor/bin/phpunit -c tests/phpunit.xml
diff --git a/tests/.gitattributes b/tests/.gitattributes
new file mode 100644
index 00000000000..0434e910539
--- /dev/null
+++ b/tests/.gitattributes
@@ -0,0 +1,5 @@
+# prevent git EOL conversion
+/src/sql/*.sql -text
+/src/format-flowed.txt -text
+/src/format-flowed-unfolded.txt -text
+*.php eol=lf
diff --git a/tests/ActionTestCase.php b/tests/ActionTestCase.php
index 5122d6bea78..2133b8b9607 100644
--- a/tests/ActionTestCase.php
+++ b/tests/ActionTestCase.php
@@ -113,8 +113,9 @@ public static function initDB($file = null)
         }
         else if ($dsn['phptype'] == 'sqlite') {
             $db->closeConnection();
+
             // delete database file
-            system(sprintf('rm -f %s', escapeshellarg($dsn['database'])));
+            unlink($dsn['database']);
 
             // load sample test data
             self::loadSQLScript($db, 'init');
diff --git a/tests/Framework/Rcube.php b/tests/Framework/Rcube.php
index a61c6da9956..c15bea049f8 100644
--- a/tests/Framework/Rcube.php
+++ b/tests/Framework/Rcube.php
@@ -69,6 +69,13 @@ function test_encrypt_and_decrypt()
      */
     function test_exec()
     {
+        if (PHP_OS_FAMILY === 'Windows') {
+            $this->assertSame('', rcube::exec('where.exe unknown-command-123 2> nul'));
+            $this->assertSame('12', rcube::exec('set /a 10 + {v}', ['v' => '2']));
+
+            return;
+        }
+
         $this->assertSame('', rcube::exec('which unknown-command-123'));
         $this->assertSame("2038\n", rcube::exec('date --date={date} +%Y', ['date' => '@2147483647']));
         // TODO: More cases
diff --git a/tests/Framework/TnefDecoder.php b/tests/Framework/TnefDecoder.php
index 91f16779058..16b5937ea33 100644
--- a/tests/Framework/TnefDecoder.php
+++ b/tests/Framework/TnefDecoder.php
@@ -57,7 +57,7 @@ function test_rtf2text()
         $body = file_get_contents(TESTS_DIR . 'src/sample.rtf');
         $text = rcube_tnef_decoder::rtf2text($body);
 
-        $this->assertMatchesRegularExpression('/^[a-zA-Z1-6!&<,> \n\.]+$/', $text);
+        $this->assertMatchesRegularExpression('/^[a-zA-Z1-6!&<,> \n\r\.]+$/', $text);
         $this->assertTrue(strpos($text, 'Alex Skolnick') !== false);
         $this->assertTrue(strpos($text, 'Heading 1') !== false);
         $this->assertTrue(strpos($text, 'Heading 2') !== false);
diff --git a/tests/Rcmail/Install.php b/tests/Rcmail/Install.php
index 691415104bc..8735c4ad975 100644
--- a/tests/Rcmail/Install.php
+++ b/tests/Rcmail/Install.php
@@ -74,6 +74,10 @@ function test_check_mime_detection()
 
     /**
      * Test check_mime_extensions() method
+     *
+     * Windows feature request: https://github.com/php/php-src/issues/12918
+     *
+     * @requires OSFAMILY Linux
      */
     function test_check_mime_extensions()
     {