diff --git a/client/modules/IDE/components/Editor/index.jsx b/client/modules/IDE/components/Editor/index.jsx
index cd060d3bb5..87f456a126 100644
--- a/client/modules/IDE/components/Editor/index.jsx
+++ b/client/modules/IDE/components/Editor/index.jsx
@@ -338,7 +338,7 @@ class Editor extends React.Component {
       mode = 'application/json';
     } else if (fileName.match(/.+\.(frag|glsl)$/i)) {
       mode = 'x-shader/x-fragment';
-    } else if (fileName.match(/.+\.(vert|stl)$/i)) {
+    } else if (fileName.match(/.+\.(vert|stl|mtl)$/i)) {
       mode = 'x-shader/x-vertex';
     } else {
       mode = 'text/plain';
diff --git a/server/utils/fileUtils.js b/server/utils/fileUtils.js
index 32a7a0e032..cd718a27b8 100644
--- a/server/utils/fileUtils.js
+++ b/server/utils/fileUtils.js
@@ -40,7 +40,8 @@ export const fileExtensionsArray = [
   'frag',
   'bin',
   'xml',
-  'stl'
+  'stl',
+  'mtl'
 ];
 
 export const mimeTypes = `image/*,audio/*,text/javascript,text/html,text/css,
@@ -66,10 +67,10 @@ export const MEDIA_FILE_QUOTED_REGEX = new RegExp(
 
 export const STRING_REGEX = /(['"])((\\\1|.)*?)\1/gm;
 // these are files that have to be linked to with a blob url
-export const PLAINTEXT_FILE_REGEX = /.+\.(json|txt|csv|vert|frag|tsv|xml|stl)$/i;
+export const PLAINTEXT_FILE_REGEX = /.+\.(json|txt|csv|vert|frag|tsv|xml|stl|mtl)$/i;
 // these are files that users would want to edit as text (maybe svg should be here?)
-export const TEXT_FILE_REGEX = /.+\.(json|txt|csv|tsv|vert|frag|js|css|html|htm|jsx|xml|stl)$/i;
+export const TEXT_FILE_REGEX = /.+\.(json|txt|csv|tsv|vert|frag|js|css|html|htm|jsx|xml|stl|mtl)$/i;
 export const NOT_EXTERNAL_LINK_REGEX = /^(?!(http:\/\/|https:\/\/))/;
 export const EXTERNAL_LINK_REGEX = /^(http:\/\/|https:\/\/)/;
 
-export const CREATE_FILE_REGEX = /.+\.(json|txt|csv|tsv|js|css|frag|vert|xml|html|htm|stl)$/i;
+export const CREATE_FILE_REGEX = /.+\.(json|txt|csv|tsv|js|css|frag|vert|xml|html|htm|stl|mtl)$/i;
diff --git a/translations/locales/be/translations.json b/translations/locales/be/translations.json
index 4b81e4794c..04bf51f10a 100644
--- a/translations/locales/be/translations.json
+++ b/translations/locales/be/translations.json
@@ -249,7 +249,7 @@
     "Title": "ফাইল তৈরি করুন",
     "CloseButtonARIA": "নতুন ফাইল মোডাল বন্ধ করুন",
     "EnterName": "নাম লিখুন",
-    "InvalidType": "অবৈধ ফাইল ধরন। বৈধ এক্সটেনশনগুলি হলো .js, .css, .json, .xml, .stl, .txt, .csv, .tsv, .frag এবং .vert."
+    "InvalidType": "অবৈধ ফাইল ধরন। বৈধ এক্সটেনশনগুলি হলো .js, .css, .json, .xml, .stl, .txt, .csv, .tsv, .mtl, .frag এবং .vert."
   },
   "NewFileForm": {
     "AddFileSubmit": "ফাইল যোগ করুন",
diff --git a/translations/locales/en-US/translations.json b/translations/locales/en-US/translations.json
index 45afb19bed..d227418ba7 100644
--- a/translations/locales/en-US/translations.json
+++ b/translations/locales/en-US/translations.json
@@ -254,7 +254,7 @@
     "Title": "Create File",
     "CloseButtonARIA": "Close New File Modal",
     "EnterName": "Please enter a name",
-    "InvalidType": "Invalid file type. Valid extensions are .js, .css, .json, .xml, .stl, .txt, .csv, .tsv, .frag, and .vert."
+    "InvalidType": "Invalid file type. Valid extensions are .js, .css, .json, .xml, .stl, .txt, .csv, .tsv, .mtl, .frag, and .vert."
   },
   "NewFileForm": {
     "AddFileSubmit": "Add File",
diff --git a/translations/locales/es-419/translations.json b/translations/locales/es-419/translations.json
index 1c0faf6f6a..778787d8cb 100644
--- a/translations/locales/es-419/translations.json
+++ b/translations/locales/es-419/translations.json
@@ -243,7 +243,7 @@
     "Title": "Crear Archivo",
     "CloseButtonARIA": "Cerrar diálogo de crear archivo",
     "EnterName": "Por favor introduce un nombre",
-    "InvalidType": "Tipo de archivo inválido. Las extensiones válidas son .js, .css, .json, .xml, .stl, .txt, .csv, .tsv, .frag y .vert."
+    "InvalidType": "Tipo de archivo inválido. Las extensiones válidas son .js, .css, .json, .xml, .stl, .txt, .csv, .tsv, .mtl, .frag y .vert."
   },
   "NewFileForm": {
     "AddFileSubmit": "Agregar Archivo",
diff --git a/translations/locales/hi/translations.json b/translations/locales/hi/translations.json
index ef119aa697..e13634efca 100644
--- a/translations/locales/hi/translations.json
+++ b/translations/locales/hi/translations.json
@@ -255,7 +255,7 @@
       "Title": "फ़ाइल बनाएँ",
       "CloseButtonARIA": "नई फ़ाइल मोडल बंद करें",
       "EnterName": "कृपया एक नाम दर्ज करें",
-      "InvalidType": "अमान्य फ़ाइल प्रकार। मान्य एक्सटेंशन हैं .js, .css, .json, .xml, .stl, .txt, .csv, .tsv, .frag, और .vert."
+      "InvalidType": "अमान्य फ़ाइल प्रकार। मान्य एक्सटेंशन हैं .js, .css, .json, .xml, .stl, .txt, .csv, .tsv, .mtl, .frag, और .vert."
     },
     "NewFileForm": {
       "AddFileSubmit": "फाइल जोडें",
diff --git a/translations/locales/ja/translations.json b/translations/locales/ja/translations.json
index 61d9fe28a4..f43b64f009 100644
--- a/translations/locales/ja/translations.json
+++ b/translations/locales/ja/translations.json
@@ -243,7 +243,7 @@
       "Title": "ファイル作成",
       "CloseButtonARIA": "新規ファイルモーダルを閉じる",
       "EnterName": "ファイル名を入力してください",
-      "InvalidType": "ファイルタイプが無効です。有効な拡張子は、.js、.css、.json、.xml、.stl、.txt、.csv、.tsv、.frag、.vertです。"
+      "InvalidType": "ファイルタイプが無効です。有効な拡張子は、.js、.css、.json、.xml、.stl、.txt、.csv、.tsv、.mtl、.frag、.vertです。"
     },
     "NewFileForm": {
       "AddFileSubmit": "ファイルを追加",