diff --git a/client/src/extension.ts b/client/src/extension.ts
index bada7064..bb7b709a 100644
--- a/client/src/extension.ts
+++ b/client/src/extension.ts
@@ -103,6 +103,9 @@ export async function activate(
       { scheme: "deno", language: "javascriptreact" },
       { scheme: "deno", language: "typescript" },
       { scheme: "deno", language: "typescriptreact" },
+      { scheme: "file", language: "json" },
+      { scheme: "file", language: "jsonc" },
+      { scheme: "file", language: "markdown" },
     ],
     diagnosticCollectionName: "deno",
     initializationOptions: getSettings(),