Large files are split to bypass the upload limits of hosting services or to fit onto smaller storage media like FAT32 drives.
Developers use OBB files to deliver heavy content separately from the application's executable code. Download (O B) part3 rar
Downloading multi-part archives from third-party sources carries inherent risks. Users often encounter these files on community forums or sharing sites where "O B" might also stand for "Open Beta" or a specific project initials. Large files are split to bypass the upload