1- That some download managers like Internet Download Manager (IDM) sometimes automatically rename’s the.001 extension files while downloading and change its extension to.avi 2. Open HJSplit and click the button JOIN. There is a Split section, a Join section (which we will be using soon), a Comparesection, and a Checksum section. Joining your files Press on the Join button to open up the File Joining window. Press on Input and navigate to the folder where you placed the pieces. Select the first piece,.001, and then press 'Open'. Open up your 7-Zip file manager and navigate to the folder you just extracted the multipart files. (the ones that end in.001,.002, ect. If needed) Right click on the file that ends in.001 as that is part one and choose 'combine'. This doesn't mean right click on the.001 file where you unzipped it.

7zip Split Combine 001 002

How to join .001 files” or 'How to join avi.001 or mp3,rmvb,mpeg.001'– this is the question that most online users who download stuffs are asking. With sites like mediafire, megaupload, netload, deposit files, etc. limiting file size for upload and download, people are dividing large files into smaller parts. Suppose you have a file which is of 900 mb, and you want it to upload on meadiafire.com. But, the problem is if you don’t have a premium account, you cannot upload more than 100mb sized files on mediafire.com. So, the question arises. To solve the problem, you can simply download a file splitter or joiner like hjsplit. You can download it from here.

Most of the files that you see of the form .001, .002 are split using hjsplit. To join them you just need to use hjsplit. You do not have to install HJSplit. Just extract 'hjsplit.zip' which you would download and double click on HJSplit.exe to start HJSplit. After thar, the main window of HJSplit will appear. To join the files, click on 'Join':

001 File Type

In the new window that appears, click on input file.

In the new window, select only the first file of the files that we would like to join (it automatically shows only .001 file), so fired.avi.001 in this case, and click on 'Open' after that.

Click on 'Start'.

Now HJSplit will join the file, in few seconds. When it is finished you will see this message:

The files have been successfully joined! The joined output file is stored in the default location, which would be same as the location of your input .001 file.

'How to split files into .001, .002, etc.' - To split files of large size using hjsplit into smaller files, you have to employ the same process - just use split instead of join and specify the size of splitted files, preferably keep it to 100mb.