diff --git a/src/core/services/utils/mimetype.ts b/src/core/services/utils/mimetype.ts
index 69d6496a9..dc537b7b5 100644
--- a/src/core/services/utils/mimetype.ts
+++ b/src/core/services/utils/mimetype.ts
@@ -312,17 +312,12 @@ export class CoreMimetypeUtilsProvider {
      * @returns The lowercased extension without the dot, or undefined.
      */
     guessExtensionFromUrl(fileUrl: string): string | undefined {
-        const split = CoreUrl.removeUrlAnchor(fileUrl).split('.');
+        const parsed = CoreUrl.parse(fileUrl);
+        const split = parsed?.path?.split('.');
         let extension: string | undefined;
 
-        if (split.length > 1) {
-            let candidate = split[split.length - 1].toLowerCase();
-            // Remove params if any.
-            const position = candidate.indexOf('?');
-            if (position > -1) {
-                candidate = candidate.substring(0, position);
-            }
-
+        if (split && split.length > 1) {
+            const candidate = split[split.length - 1].toLowerCase();
             if (EXTENSION_REGEX.test(candidate)) {
                 extension = candidate;
             }