If you want the "long text" to appear immediately when someone opens the archive in WinRAR , use the feature: Open WinRAR and double-click your Pulsive_PASS123.rar file. Click the Comment button on the top toolbar. Type or paste your long text into the window that appears.
Create a new document in (or any text editor) and write your content. Save it as README.txt or Instructions.txt . Pulsive_PASS123.rar
Drag and drop this .txt file into your Pulsive_PASS123.rar archive. If you want the "long text" to appear