X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/d9561b0197cba4a9a0f70929eb03c892df5c4543..76e3ea1d0d2f865272000a5e12f64266a90b3794:/apps/workbench/app/helpers/collections_helper.rb

diff --git a/apps/workbench/app/helpers/collections_helper.rb b/apps/workbench/app/helpers/collections_helper.rb
index 25f2cb53e6..f5f54851e7 100644
--- a/apps/workbench/app/helpers/collections_helper.rb
+++ b/apps/workbench/app/helpers/collections_helper.rb
@@ -1,3 +1,7 @@
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
 module CollectionsHelper
   def d3ify_links(links)
     links.collect do |x|
@@ -60,7 +64,11 @@ module CollectionsHelper
   def preview_allowed_for file_name
     file_type = MIME::Types.type_for(file_name).first
     if file_type.nil?
-      false
+      if file_name.downcase.end_with?('.cwl') # unknown mime type, but we support preview
+        true
+      else
+        false
+      end
     elsif (file_type.raw_media_type == "text") || (file_type.raw_media_type == "image")
       true
     elsif (file_type.raw_media_type == "application") &&