diff --git a/packages/xod-fs/src/constants.js b/packages/xod-fs/src/constants.js
index 86ce75f6..33ec84fd 100644
--- a/packages/xod-fs/src/constants.js
+++ b/packages/xod-fs/src/constants.js
@@ -7,6 +7,7 @@ export const BASE64_EXTNAMES = ['.png', '.jpg', '.jpeg', '.gif', '.fzz'];
 export const UTF8_EXTNAMES = [
   '.md',
   '.svg',
+  '.tsv',
   // Implementation files
   '.c',
   '.cpp',