To help me give you more specific text, could you tell me or where you plan to use this text (e.g., a download page, a personal folder, or an email)?
You only need to right-click and extract the first part (.part1); compatible software like WinRAR will automatically find the subsequent parts to reconstruct the original data. Erdechu.part1.rar
Since "Erdechu.part1.rar" refers to a , the most appropriate text depends on whether you are sharing it, storing it, or documenting how to open it. Options for File Descriptions To help me give you more specific text,
"Erdechu Project Files - Multi-part Archive (Part 1 of X)." a download page
A .part1.rar file is a digital container that has been divided into smaller pieces to make it easier to store or transfer.