diff --git a/openlp/core/api/main.py b/openlp/core/api/main.py
index 89780ad28..ddbd5a154 100644
--- a/openlp/core/api/main.py
+++ b/openlp/core/api/main.py
@@ -27,25 +27,186 @@ from openlp.core.common.applocation import AppLocation
 main_views = Blueprint('main', __name__)
 
 
+def get_mime_type(file):
+    if file.lower().endswith('.aac'):
+        mime_type = 'audio/aac'
+    elif file.lower().endswith('.abw'):
+        mime_type = 'application/x-abiword'
+    elif file.lower().endswith('.arc'):
+        mime_type = 'application/x-freearc'
+    elif file.lower().endswith('.avi'):
+        mime_type = 'video/x-msvideo'
+    elif file.lower().endswith('.azw'):
+        mime_type = 'application/vnd.amazon.ebook'
+    elif file.lower().endswith('.bin'):
+        mime_type = 'application/octet-stream'
+    elif file.lower().endswith('.bmp'):
+        mime_type = 'image/bmp'
+    elif file.lower().endswith('.bz'):
+        mime_type = 'application/x-bzip'
+    elif file.lower().endswith('.bz2'):
+        mime_type = 'application/x-bzip2'
+    elif file.lower().endswith('.cda'):
+        mime_type = 'application/x-cdf'
+    elif file.lower().endswith('.csh'):
+        mime_type = 'application/x-csh'
+    elif file.lower().endswith('.css'):
+        mime_type = 'text/css'
+    elif file.lower().endswith('.csv'):
+        mime_type = 'text/csv'
+    elif file.lower().endswith('.doc'):
+        mime_type = 'application/msword'
+    elif file.lower().endswith('.docx'):
+        mime_type = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
+    elif file.lower().endswith('.eot'):
+        mime_type = 'application/vnd.ms-fontobject'
+    elif file.lower().endswith('.epub'):
+        mime_type = 'application/epub+zip'
+    elif file.lower().endswith('.gz'):
+        mime_type = 'application/gzip'
+    elif file.lower().endswith('.gif'):
+        mime_type = 'image/gif'
+    elif file.lower().endswith('.htm'):
+        mime_type = 'text/html'
+    elif file.lower().endswith('.html'):
+        mime_type = 'text/html'
+    elif file.lower().endswith('.ico'):
+        mime_type = 'image/vnd.microsoft.icon'
+    elif file.lower().endswith('.ics'):
+        mime_type = 'text/calendar'
+    elif file.lower().endswith('.jar'):
+        mime_type = 'application/java-archive'
+    elif file.lower().endswith('.jpeg'):
+        mime_type = 'image/jpeg'
+    elif file.lower().endswith('.jpg'):
+        mime_type = 'image/jpeg'
+    elif file.lower().endswith('.js'):
+        mime_type = 'application/javascript'
+    elif file.lower().endswith('.json'):
+        mime_type = 'application/json'
+    elif file.lower().endswith('.jsonld'):
+        mime_type = 'application/ld+json'
+    elif file.lower().endswith('.mid'):
+        mime_type = 'audio/midi'
+    elif file.lower().endswith('.midi'):
+        mime_type = 'audio/x-midi'
+    elif file.lower().endswith('.mjs'):
+        mime_type = 'text/javascript'
+    elif file.lower().endswith('.mp3'):
+        mime_type = 'audio/mpeg'
+    elif file.lower().endswith('.mp4'):
+        mime_type = 'video/mp4'
+    elif file.lower().endswith('.mpeg'):
+        mime_type = 'video/mpeg'
+    elif file.lower().endswith('.mpkg'):
+        mime_type = 'application/vnd.apple.installer+xml'
+    elif file.lower().endswith('.odp'):
+        mime_type = 'application/vnd.oasis.opendocument.presentation'
+    elif file.lower().endswith('.ods'):
+        mime_type = 'application/vnd.oasis.opendocument.spreadsheet'
+    elif file.lower().endswith('.odt'):
+        mime_type = 'application/vnd.oasis.opendocument.text'
+    elif file.lower().endswith('.oga'):
+        mime_type = 'audio/ogg'
+    elif file.lower().endswith('.ogv'):
+        mime_type = 'video/ogg'
+    elif file.lower().endswith('.ogx'):
+        mime_type = 'application/ogg'
+    elif file.lower().endswith('.opus'):
+        mime_type = 'audio/opus'
+    elif file.lower().endswith('.otf'):
+        mime_type = 'application/x-font-opentype'
+    elif file.lower().endswith('.png'):
+        mime_type = 'image/png'
+    elif file.lower().endswith('.pdf'):
+        mime_type = 'application/pdf'
+    elif file.lower().endswith('.php'):
+        mime_type = 'application/x-httpd-php'
+    elif file.lower().endswith('.ppt'):
+        mime_type = 'application/vnd.ms-powerpoint'
+    elif file.lower().endswith('.pptx'):
+        mime_type = 'application/vnd.openxmlformats-officedocument.presentationml.presentation'
+    elif file.lower().endswith('.rar'):
+        mime_type = 'application/vnd.rar'
+    elif file.lower().endswith('.rtf'):
+        mime_type = 'application/rtf'
+    elif file.lower().endswith('.sfnt'):
+        mime_type = 'application/font-sfnt'
+    elif file.lower().endswith('.sh'):
+        mime_type = 'application/x-sh'
+    elif file.lower().endswith('.svg'):
+        mime_type = 'image/svg+xml'
+    elif file.lower().endswith('.swf'):
+        mime_type = 'application/x-shockwave-flash'
+    elif file.lower().endswith('.tar'):
+        mime_type = 'application/x-tar'
+    elif file.lower().endswith('.tif'):
+        mime_type = 'image/tiff'
+    elif file.lower().endswith('.tiff'):
+        mime_type = 'image/tiff'
+    elif file.lower().endswith('.ts'):
+        mime_type = 'video/mp2t'
+    elif file.lower().endswith('.ttf'):
+        mime_type = 'application/x-font-ttf'
+    elif file.lower().endswith('.txt'):
+        mime_type = 'text/plain'
+    elif file.lower().endswith('.vsd'):
+        mime_type = 'application/vnd.visio'
+    elif file.lower().endswith('.wav'):
+        mime_type = 'audio/wav'
+    elif file.lower().endswith('.weba'):
+        mime_type = 'audio/webm'
+    elif file.lower().endswith('.webm'):
+        mime_type = 'video/webm'
+    elif file.lower().endswith('.webp'):
+        mime_type = 'image/webp'
+    elif file.lower().endswith('.woff'):
+        mime_type = 'application/font-woff'
+    elif file.lower().endswith('.woff2'):
+        mime_type = 'application/font-woff2'
+    elif file.lower().endswith('.xhtml'):
+        mime_type = 'application/xhtml+xml'
+    elif file.lower().endswith('.xls'):
+        mime_type = 'application/vnd.ms-excel'
+    elif file.lower().endswith('.xlsx'):
+        mime_type = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
+    elif file.lower().endswith('.xml'):
+        mime_type = 'application/xml'
+    elif file.lower().endswith('.xul'):
+        mime_type = 'application/vnd.mozilla.xul+xml'
+    elif file.lower().endswith('.zip'):
+        mime_type = 'application/zip'
+    elif file.lower().endswith('.7z'):
+        mime_type = 'application/x-7z-compressed'
+    else:
+        mime_type = 'application/octet-stream'
+    return mime_type
+
+
 @main_views.route('/', defaults={'path': ''})
 @main_views.route('/<path>')
 def index(path):
     if os.path.isfile(AppLocation.get_section_data_path('remotes') / path):
-        return send_from_directory(str(AppLocation.get_section_data_path('remotes')), path)
+        return send_from_directory(str(AppLocation.get_section_data_path('remotes')),
+                                   path, mimetype=get_mime_type(path))
     else:
-        return send_from_directory(str(AppLocation.get_section_data_path('remotes')), 'index.html')
+        return send_from_directory(str(AppLocation.get_section_data_path('remotes')),
+                                   'index.html', mimetype='text/html')
 
 
 @main_views.route('/assets/<path>')
 def assets(path):
-    return send_from_directory(str(AppLocation.get_section_data_path('remotes') / 'assets'), path)
+    return send_from_directory(str(AppLocation.get_section_data_path('remotes') / 'assets'),
+                               path, mimetype=get_mime_type(path))
 
 
 @main_views.route('/stage/<path>/')
 def stages(path):
-    return send_from_directory(str(AppLocation.get_section_data_path('stages') / path), 'stage.html')
+    return send_from_directory(str(AppLocation.get_section_data_path('stages') / path),
+                               'stage.html', mimetype='text/html')
 
 
 @main_views.route('/stage/<path:path>/<file>')
 def stage_assets(path, file):
-    return send_from_directory(str(AppLocation.get_section_data_path('stages') / path), file)
+    return send_from_directory(str(AppLocation.get_section_data_path('stages') / path),
+                               file, mimetype=get_mime_type(file))
diff --git a/tests/openlp_core/api/test_main.py b/tests/openlp_core/api/test_main.py
new file mode 100644
index 000000000..b49de1922
--- /dev/null
+++ b/tests/openlp_core/api/test_main.py
@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+
+##########################################################################
+# OpenLP - Open Source Lyrics Projection                                 #
+# ---------------------------------------------------------------------- #
+# Copyright (c) 2008-2021 OpenLP Developers                              #
+# ---------------------------------------------------------------------- #
+# This program is free software: you can redistribute it and/or modify   #
+# it under the terms of the GNU General Public License as published by   #
+# the Free Software Foundation, either version 3 of the License, or      #
+# (at your option) any later version.                                    #
+#                                                                        #
+# This program is distributed in the hope that it will be useful,        #
+# but WITHOUT ANY WARRANTY; without even the implied warranty of         #
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          #
+# GNU General Public License for more details.                           #
+#                                                                        #
+# You should have received a copy of the GNU General Public License      #
+# along with this program.  If not, see <https://www.gnu.org/licenses/>. #
+##########################################################################
+
+from openlp.core.api.main import get_mime_type
+
+
+def test_get_mime_type():
+    assert get_mime_type('index.html') == 'text/html'
+    assert get_mime_type('stage.js') == 'application/javascript'
+    assert get_mime_type('stage.css') == 'text/css'