How to join 001 files?

Sometimes we have to deal with .001 which are part of Files.

We want to join these 001 files into one single file and commanly used WINRAR not able to join .

For joining here we take 7-zip which can be download here.

Now the procedure to join the 001 file.

1.download and install 7-zip.

2.Find 001 file and right click on it and select 7-zip.
3.now Select Extract here option .
4.

Now you all  done.

Thanks.