Knowing this helps me tell you exactly what software to use to open it.

Ensure you have .part1.rar , .part2.rar , and .part3.rar .

Extracting part1 will automatically combine all parts and reconstruct the original file(s). Common Scenarios

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?

The .part3.rar extension confirms this is the third piece. It cannot be extracted alone.

This indicates that a larger file or a collection of files (possibly an image of an SD card, a compressed backup, or data intended for an SD card) has been split into at least three smaller parts (.part1.rar, .part2.rar, .part3.rar) to make transferring, uploading, or downloading them easier. What is this file?

Based on the file naming convention, is a segment of a multi-part RAR archive .

The "256mb" in the name likely implies the total content, when fully extracted, is 256 Megabytes. How to Use This File To access the contents, you must have all the parts ( , etc.) in the same folder.