X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/060d38d627bd1e51dd2b3c6e7de9af6aa7d7b6f3..8299fa11d1e813ea52e3ea482214d12044119bc3:/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 e249eaa8ac..f5f54851e7 100644
--- a/apps/workbench/app/helpers/collections_helper.rb
+++ b/apps/workbench/app/helpers/collections_helper.rb
@@ -64,7 +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") &&