To join movie in my blog, u need to use  HJSPLIT

How To Use HJSPLIT

1. After download all part of 001,002,003,004 file. Open HJSplit and click join like below pic.

2. Search for the file that you downloaded. Click Input File.

3. Example: The file 'Please Tech Me English.rmvb.001. Yes, it's the only file found even though you downloaded all 4 parts. 001 is the main file needed to combine all parts, so don't be alarmed. If you do not file 001 file, it's mean you did not download the core part. After that press Start.

4. It should be like the below pic.

5. If you see below pic, then all part file joined.

6. Done..