diff --git a/apps/api/app/controllers/files_controller.rb b/apps/api/app/controllers/files_controller.rb
index 0ba718f..e173f0f 100644
--- a/apps/api/app/controllers/files_controller.rb
+++ b/apps/api/app/controllers/files_controller.rb
@@ -5,7 +5,10 @@ class FilesController < ApplicationController
     result = FileService.new.show(FileShowInput.new(path: params[:path]))
     case result.type
     when :redirect  then redirect_to result.url, status: :moved_permanently
-    when :file      then send_file result.path, disposition: "inline"
+    when :file
+      ext = File.extname(result.path.to_s).delete_prefix(".")
+      mime = Mime::Type.lookup_by_extension(ext) || "application/octet-stream"
+      send_file result.path, disposition: "inline", type: mime
     when :not_found then head :not_found
     end
   end