Here I will tell the software to friends who like to download movies from the internet. Not all of them are usually the films were uploaded in full accordance with the actual size. To simplify the process of uploading the movie is usually the films that will be divided into several sections. One case in which this time will be discussed is when we download some movie parts that behind the name of the file containing the number .001 or .002, for example HarryPotter2010.AKP.part.001. For this case my friends need not worry, just download all the files provided by the server provider that will be your downloaded movie. After all parts are downloaded, place all the files in one folder. Then run this hjsplit. Click join, then select the file extension .001 behind numbered then begin the process of merging. Note: The merged file must have the same first name, for example HarryPotter2010.AKP.part.001, HarryPotter2010.AKP.part.002, and HarryPotter2010.AKP.part.003)

Here's the download link from HJSplit

source : http://www.freebyte.com/hjsplit/