diff --git a/src/ApiClient.js b/src/ApiClient.js
index 337b075..7b41f93 100644
--- a/src/ApiClient.js
+++ b/src/ApiClient.js
@@ -157,7 +157,7 @@
    */
   exports.prototype.isFileParam = function(param) {
     // fs.ReadStream in Node.js (but not in runtime like browserify)
-    if (typeof window === 'undefined' &&
+    if (Object.prototype.toString.call(global.process) === '[object process]' &&
         typeof require === 'function' &&
         require('fs') &&
         param instanceof require('fs').ReadStream) {
diff --git a/src/api/DefaultApi.js b/src/api/DefaultApi.js
index a51a9a0..457949a 100644
--- a/src/api/DefaultApi.js
+++ b/src/api/DefaultApi.js
@@ -324,7 +324,7 @@
       var authNames = ['Token'];
       var contentTypes = [];
       var accepts = ['image/png', 'image/jpeg', 'applicant/pdf'];
-      var returnType = File;
+      var returnType = (typeof File !== 'undefined') ? File : [];
 
       return this.apiClient.callApi(
         '/applicants/{applicant_id}/documents/{document_id}/download', 'GET',
@@ -370,7 +370,7 @@
       var authNames = ['Token'];
       var contentTypes = [];
       var accepts = ['application/json'];
-      var returnType = File;
+      var returnType = (typeof File !== 'undefined') ? File : [];
 
       return this.apiClient.callApi(
         '/live_photos/{live_photo_id}/download', 'GET',