diff --git a/node_modules/react-native-file-viewer/android/src/main/java/com/vinzscam/reactnativefileviewer/RNFileViewerModule.java b/node_modules/react-native-file-viewer/android/src/main/java/com/vinzscam/reactnativefileviewer/RNFileViewerModule.java
index 93f7881..d81f609 100644
--- a/node_modules/react-native-file-viewer/android/src/main/java/com/vinzscam/reactnativefileviewer/RNFileViewerModule.java
+++ b/node_modules/react-native-file-viewer/android/src/main/java/com/vinzscam/reactnativefileviewer/RNFileViewerModule.java
@@ -6,6 +6,7 @@ import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.net.Uri;
 import androidx.core.content.FileProvider;
+import android.text.TextUtils;
 import android.webkit.MimeTypeMap;
 
 import com.facebook.react.bridge.ActivityEventListener;
@@ -41,6 +42,21 @@ public class RNFileViewerModule extends ReactContextBaseJavaModule {
     reactContext.addActivityEventListener(mActivityEventListener);
   }
 
+  private static String getExtension(String uri) {
+    if (uri == null) {
+      return null;
+    }
+
+    int dot = uri.lastIndexOf(".");
+    if (dot >= 0) {
+      // exclude the dot
+      return uri.substring(dot + 1);
+    } else {
+      // No extension.
+      return "";
+    }
+  }
+
   @ReactMethod
   public void open(String path, Integer currentId, ReadableMap options) {
     Uri contentUri = null;
@@ -74,6 +90,9 @@ public class RNFileViewerModule extends ReactContextBaseJavaModule {
     }
 
     String extension = MimeTypeMap.getFileExtensionFromUrl(path).toLowerCase();
+    if (TextUtils.isEmpty(extension)) {
+      extension = getExtension(path);
+    }
     String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
 
     Intent shareIntent = new Intent();