diff --git a/src/core/features/emulator/services/file-transfer.ts b/src/core/features/emulator/services/file-transfer.ts
index 59961318f..63f8baa8f 100644
--- a/src/core/features/emulator/services/file-transfer.ts
+++ b/src/core/features/emulator/services/file-transfer.ts
@@ -113,7 +113,10 @@ export class FileTransferObjectMock extends FileTransferObject {
             xhr.open('GET', source, true);
             xhr.responseType = 'blob';
             for (const name in headers) {
-                xhr.setRequestHeader(name, headers[name]);
+                // We can't set the User-Agent in browser.
+                if (name !== 'User-Agent') {
+                    xhr.setRequestHeader(name, headers[name]);
+                }
             }
 
             xhr.onprogress = (ev: ProgressEvent): void => {
@@ -332,7 +335,7 @@ export class FileTransferObjectMock extends FileTransferObject {
                 xhr.open(httpMethod || 'POST', url);
                 for (const name in headers) {
                     // Filter "unsafe" headers.
-                    if (name != 'Connection') {
+                    if (name !=='Connection' && name !== 'User-Agent') {
                         xhr.setRequestHeader(name, headers[name]);
                     }
                 }
diff --git a/src/core/services/ws.ts b/src/core/services/ws.ts
index 866ed0724..9d9e270de 100644
--- a/src/core/services/ws.ts
+++ b/src/core/services/ws.ts
@@ -270,7 +270,11 @@ export class CoreWSProvider {
             onProgress && transfer.onProgress(onProgress);
 
             // Download the file in the tmp file.
-            await transfer.download(url, fileEntry.toURL(), true);
+            await transfer.download(url, fileEntry.toURL(), true, {
+                headers: {
+                    'User-Agent': navigator.userAgent, // eslint-disable-line @typescript-eslint/naming-convention
+                },
+            });
 
             let extension = '';
 
@@ -885,7 +889,9 @@ export class CoreWSProvider {
             itemid: options.itemId || 0,
         };
         options.chunkedMode = false;
-        options.headers = {};
+        options.headers = {
+            'User-Agent': navigator.userAgent, // eslint-disable-line @typescript-eslint/naming-convention
+        };
         options['Connection'] = 'close';
 
         let success: FileUploadResult;