To give you a better idea of what this file is, could you please tell me: did you download this file from? Do you have the other parts (part2, part3, etc.)?

You must download all parts and place them in the same folder before using a file archiver like WinRAR or 7-Zip to extract them.

It is likely that sc24137-BT.part1.rar , sc24137-BT.part2.rar , etc., are needed to extract a complete file.