diff --git a/services/web/app/src/Features/Uploads/FileTypeManager.js b/services/web/app/src/Features/Uploads/FileTypeManager.js
index 389a7caa23..b67b00a5d1 100644
--- a/services/web/app/src/Features/Uploads/FileTypeManager.js
+++ b/services/web/app/src/Features/Uploads/FileTypeManager.js
@@ -14,6 +14,7 @@ const FileTypeManager = {
     '.bibtex',
     '.txt',
     '.tikz',
+    '.mtx',
     '.rtex',
     '.md',
     '.asy',
diff --git a/services/web/frontend/js/ide/binary-files/controllers/BinaryFileController.js b/services/web/frontend/js/ide/binary-files/controllers/BinaryFileController.js
index c4b641259f..5a1c5a0881 100644
--- a/services/web/frontend/js/ide/binary-files/controllers/BinaryFileController.js
+++ b/services/web/frontend/js/ide/binary-files/controllers/BinaryFileController.js
@@ -26,6 +26,7 @@ export default App.controller('BinaryFileController', function(
     'bibtex',
     'txt',
     'tikz',
+    'mtx',
     'rtex',
     'md',
     'asy',