Use WinRAR or 7-Zip to open the first file (part1).
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 "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. Use WinRAR or 7-Zip to open the first file (part1)
The .part3.rar extension confirms this is the third piece. It cannot be extracted alone. when fully extracted