diff --git a/index.d.ts b/index.d.ts
index 38946d4d..4aba233b 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -15,12 +15,15 @@ declare module 'react-native-document-picker' {
       audio: 'audio/*';
       csv: 'text/csv';
       doc: 'application/msword';
-      excel: 'application/vnd.ms-excel';
+      docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
       images: 'image/*';
       pdf: 'application/pdf';
       plainText: 'text/plain';
-      powerpoint: 'application/vnd.ms-powerpoint';
+      ppt: 'application/vnd.ms-powerpoint';
+      pptx: 'application/vnd.openxmlformats-officedocument.presentationml.presentation';
       video: 'video/*';
+      xls: 'application/vnd.ms-excel';
+      xlsx: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
       zip: 'application/zip';
     };
     utis: {
@@ -28,25 +31,31 @@ declare module 'react-native-document-picker' {
       audio: 'public.audio';
       csv: 'public.comma-separated-values-text';
       doc: 'com.microsoft.word.doc';
-      excel: 'com.microsoft.excel.xls';
+      docx: 'org.openxmlformats.wordprocessingml.document';
       images: 'public.image';
       pdf: 'com.adobe.pdf';
       plainText: 'public.plain-text';
-      powerpoint: 'com.microsoft.powerpoint.ppt';
+      ppt: 'com.microsoft.powerpoint.ppt';
+      pptx: 'org.openxmlformats.presentationml.presentation';
       video: 'public.movie';
+      xls: 'com.microsoft.excel.xls';
+      xlsx: 'org.openxmlformats.spreadsheetml.sheet';
       zip: 'public.zip-archive';
     };
     extensions: {
       allFiles: '*';
       audio: '.3g2 .3gp .aac .adt .adts .aif .aifc .aiff .asf .au .m3u .m4a .m4b .mid .midi .mp2 .mp3 .mp4 .rmi .snd .wav .wax .wma';
       csv: '.csv';
-      doc: '.doc .docx';
-      excel: '.xls .xlsx';
+      doc: '.doc';
+      docx: '.docx';
       images: '.jpeg .jpg .png';
       pdf: '.pdf';
       plainText: '.txt';
-      powerpoint: '.ppt .pptx';
+      ppt: '.ppt';
+      pptx: '.pptx';
       video: '.mp4';
+      xls: '.xls';
+      xlsx: '.xlsx';
       zip: '.zip .gz';
     };
   };
diff --git a/index.js b/index.js
index c6552136..a1ba2cca 100644
--- a/index.js
+++ b/index.js
@@ -75,12 +75,15 @@ const Types = {
     audio: 'audio/*',
     csv: 'text/csv',
     doc: 'application/msword',
-    excel: 'application/vnd.ms-excel',
+    docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
     images: 'image/*',
     pdf: 'application/pdf',
     plainText: 'text/plain',
-    powerpoint: 'application/vnd.ms-powerpoint',
+    ppt: 'application/vnd.ms-powerpoint',
+    pptx: 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
     video: 'video/*',
+    xls: 'application/vnd.ms-excel',
+    xlsx: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
     zip: 'application/zip',
   },
   utis: {
@@ -88,12 +91,15 @@ const Types = {
     audio: 'public.audio',
     csv: 'public.comma-separated-values-text',
     doc: 'com.microsoft.word.doc',
-    excel: 'com.microsoft.excel.xls',
+    docx: 'org.openxmlformats.wordprocessingml.document',
     images: 'public.image',
     pdf: 'com.adobe.pdf',
     plainText: 'public.plain-text',
-    powerpoint: 'com.microsoft.powerpoint.ppt',
+    ppt: 'com.microsoft.powerpoint.ppt',
+    pptx: 'org.openxmlformats.presentationml.presentation',
     video: 'public.movie',
+    xls: 'com.microsoft.excel.xls',
+    xlsx: 'org.openxmlformats.spreadsheetml.sheet',
     zip: 'public.zip-archive',
   },
   extensions: {
@@ -101,13 +107,16 @@ const Types = {
     audio:
       '.3g2 .3gp .aac .adt .adts .aif .aifc .aiff .asf .au .m3u .m4a .m4b .mid .midi .mp2 .mp3 .mp4 .rmi .snd .wav .wax .wma',
     csv: '.csv',
-    doc: '.doc .docx',
-    excel: '.xls .xlsx',
+    doc: '.doc',
+    docx: '.docx',
     images: '.jpeg .jpg .png',
     pdf: '.pdf',
     plainText: '.txt',
-    powerpoint: '.ppt .pptx',
+    ppt: '.ppt',
+    pptx: '.pptx',
     video: '.mp4',
+    xls: '.xls',
+    xlsx: '.xlsx',
     zip: '.zip .gz',
   },
 };