Depending on the context you are looking for, "Joh.rar" typically refers to:

Could you clarify if you are looking for a to download or a translation of this text from a particular document?

: In 19th and early 20th-century newspapers and registers (such as the Leipziger Tageblatt and The Gazette and Farmers Journal ), "Joh." and "Rar." were often used as abbreviations for names like Johann or Johannes and specific roles or surnames.