The names must be identical except for the part number. If one is named Sagem.part3(1).rar , rename it to Sagem.part3.rar so the extraction software recognizes the sequence.
When files are too large for certain servers or email limits, they are split into a "split volume set." For the file to work, you need (Part 1, Part 2, Part 3, etc.) to recreate the original data. Step-by-Step Guide to Extraction Sagem.part3.rar
Always right-click on Part 1 to begin the process. The software will automatically "look" for Part 2 and Part 3 to pull the remaining data. The names must be identical except for the part number
This usually means one of the parts (possibly Part 3) didn't download completely. Try deleting Sagem.part3.rar and downloading it again. you need (Part 1