Typically used for transferring files larger than what a single email, file-hosting service, or storage medium (like a small 256MB SD card) can hold at once.
Knowing this helps me tell you exactly what software to use to open it. SD Card 256mb.part3.rar
Extracting part1 will automatically combine all parts and reconstruct the original file(s). Common Scenarios Typically used for transferring files larger than what
A user split a large folder into chunks to fit on a small storage device. If you can, let me know: What is the size of the other parts (part1, part2)? Where did you get this file? SD Card 256mb.part3.rar
The .part3.rar extension confirms this is the third piece. It cannot be extracted alone.