You will need a program like WinRAR or 7-Zip to extract the contents.
The file is the first part of a compressed archive for a specific Japanese adult (H) media title, identified by the product code RJ327069 from the digital retailer DLsite . Product Details H-RJ327069.part1.rar
[愛玩人形は、旦那様と義父に愛される。] (The Plaything Doll is Loved by Her Husband and Father-in-Law) [1]. Circle/Developer: Miel [2]. You will need a program like WinRAR or