diff --git a/moodle/Sniffs/PHPUnit/TestCaseNamesSniff.php b/moodle/Sniffs/PHPUnit/TestCaseNamesSniff.php
index 5e81c37..05f7575 100644
--- a/moodle/Sniffs/PHPUnit/TestCaseNamesSniff.php
+++ b/moodle/Sniffs/PHPUnit/TestCaseNamesSniff.php
@@ -233,9 +233,10 @@ public function process(File $file, $pointer) {
             if ($bspos !== false) { // Only if there are level2 and down namespace.
                 $relns = str_replace('\\', '/', substr(trim($namespace, ' \\'), $bspos + 1));
 
+                $filename = MoodleUtil::getStandardisedFilename($file);
                 // Calculate the relative path under tests directory.
-                $dirpos = strripos(trim(dirname($file->getFilename()), ' /') . '/', '/tests/');
-                $reldir = str_replace('\\', '/', substr(trim(dirname($file->getFilename()), ' /'), $dirpos + 7));
+                $dirpos = strripos(trim(dirname($filename), ' /') . '/', '/tests/');
+                $reldir = str_replace('\\', '/', substr(trim(dirname($filename), ' /'), $dirpos + 7));
 
                 // Warning if the relative namespace does not match the relative directory.
                 if ($reldir !== $relns) {
diff --git a/moodle/Tests/MoodleCSBaseTestCase.php b/moodle/Tests/MoodleCSBaseTestCase.php
index 88325eb..baaf1fc 100644
--- a/moodle/Tests/MoodleCSBaseTestCase.php
+++ b/moodle/Tests/MoodleCSBaseTestCase.php
@@ -221,9 +221,13 @@ protected function verifyCsResults() {
         // Let's process the fixture.
         try {
             if ($this->fixtureFileName !== null) {
+                $fixtureFilename = $this->fixtureFileName;
+                if (DIRECTORY_SEPARATOR !== '/') {
+                    $fixtureFilename = str_replace('/', DIRECTORY_SEPARATOR, $fixtureFilename);
+                }
                 $fixtureSource = file_get_contents($this->fixture);
                 $fixtureContent = <<<EOF
-                phpcs_input_file: {$this->fixtureFileName}
+                phpcs_input_file: {$fixtureFilename}
                 {$fixtureSource}
                 EOF;
                 $phpcsfile = new \PHP_CodeSniffer\Files\DummyFile($fixtureContent, $ruleset, $config);
diff --git a/moodle/Util/Docblocks.php b/moodle/Util/Docblocks.php
index bd4fe0b..6b86cb7 100644
--- a/moodle/Util/Docblocks.php
+++ b/moodle/Util/Docblocks.php
@@ -324,7 +324,7 @@ public static function isValidTag(
         $tag = ltrim($tokens[$tagPtr]['content'], '@');
         if (array_key_exists($tag, self::$validTags)) {
             if (array_key_exists($tag, self::$pathRestrictedTags)) {
-                $file = $phpcsFile->getFilename();
+                $file = MoodleUtil::getStandardisedFilename($phpcsFile);
                 foreach (self::$pathRestrictedTags[$tag] as $path) {
                     if (preg_match($path, $file)) {
                         return true;
diff --git a/moodle/Util/MoodleUtil.php b/moodle/Util/MoodleUtil.php
index 045d3ed..4af8457 100644
--- a/moodle/Util/MoodleUtil.php
+++ b/moodle/Util/MoodleUtil.php
@@ -242,14 +242,17 @@ public static function getMoodleComponent(File $file, $selfPath = true): ?string
             }
         }
 
+        $filepath = MoodleUtil::getStandardisedFilename($file);
         // Let's find the first component that matches the file path.
         foreach ($components as $component => $componentPath) {
             // Only components with path.
             if (empty($componentPath)) {
                 continue;
             }
+
             // Look for component paths matching the file path.
-            if (strpos($file->path, $componentPath . '/') === 0) {
+            $componentPath = str_replace('\\', '/', $componentPath . DIRECTORY_SEPARATOR);
+            if (strpos($filepath, $componentPath) === 0) {
                 // First match found should be the better one always. We are done.
                 return $component;
             }
@@ -450,14 +453,15 @@ public static function getMoodleRoot(?File $file = null, bool $selfPath = true):
      */
     public static function isLangFile(File $phpcsFile): bool
     {
+        $filename = MoodleUtil::getStandardisedFilename($phpcsFile);
         // If the file is not under a /lang/[a-zA-Z0-9_-]+/ directory, nothing to check.
         // (note that we are using that regex because it's what PARAM_LANG does).
-        if (preg_match('~/lang/[a-zA-Z0-9_-]+/~', $phpcsFile->getFilename()) === 0) {
+        if (preg_match('~/lang/[a-zA-Z0-9_-]+/~', $filename) === 0) {
             return false;
         }
 
         // If the file is not a PHP file, nothing to check.
-        if (substr($phpcsFile->getFilename(), -4) !== '.php') {
+        if (substr($filename, -4) !== '.php') {
             return false;
         }
 
@@ -476,28 +480,29 @@ public static function isLangFile(File $phpcsFile): bool
      */
     public static function isUnitTest(File $phpcsFile): bool
     {
+        $filename = MoodleUtil::getStandardisedFilename($phpcsFile);
         // If the file isn't called, _test.php, nothing to check.
         if (stripos(basename($phpcsFile->getFilename()), '_test.php') === false) {
             return false;
         }
 
         // If the file isn't under tests directory, nothing to check.
-        if (stripos($phpcsFile->getFilename(), '/tests/') === false) {
+        if (stripos($filename, '/tests/') === false) {
             return false;
         }
 
         // If the file is in a fixture directory, ignore it.
-        if (stripos($phpcsFile->getFilename(), '/tests/fixtures/') !== false) {
+        if (stripos($filename, '/tests/fixtures/') !== false) {
             return false;
         }
 
         // If the file is in a generator directory, ignore it.
-        if (stripos($phpcsFile->getFilename(), '/tests/generator/') !== false) {
+        if (stripos($filename, '/tests/generator/') !== false) {
             return false;
         }
 
         // If the file is in a behat directory, ignore it.
-        if (stripos($phpcsFile->getFilename(), '/tests/behat/') !== false) {
+        if (stripos($filename, '/tests/behat/') !== false) {
             return false;
         }
 
@@ -609,4 +614,14 @@ public static function getTokensOnLine(
             ARRAY_FILTER_USE_BOTH
         );
     }
+
+    /**
+     * Get the standardised filename for the file.
+     *
+     * @param File @phpcsFile
+     * @return string
+     */
+    public static function getStandardisedFilename(File $phpcsFile): string {
+        return str_replace('\\', '/', $phpcsFile->getFilename());
+    }
 }