7-Zip 或 WinRAR
Right click the file you wantto split, Select 7-Zip and click the option Add to archive…右击你要分割的文件，选择7-zip，点击添加到压缩文件…
7-Zip automatically assigns a name for the new archive file,if you don’t want a default name,you can change it as appropriate.软件会自动为新的压缩文件生成一个名字，如果你不想要默认的名字，请自己更改它。
Make sure the Archive format is ZIP.确认压缩格式选的是ZIP
Under the option Split to volumes, either enter the desired maximum size of each file or choose an appropriate size fromthe available drop down option. In my case I entered 5 MB for each file. For safety, you can also enter a password in Encryption option.在下面的分割卷选项中，同样也输入一个每个文件的最大值，或者可以在下拉菜单中选择一个合适的大小。这里我把每个文件分成5MB.为了安全，你也可以在加密选项中输入密码。
If You want to merge them back, please select all the archive files, and right click them, Click 7-zip → Extract Here如果你想把他们合并回来，请先选中全部的分割文件，然后右击，点击7-Zip → 释放在这里.