How to open a PDO file?

How do I open a file with .avi extension, with a grey description saying 'PART file'?

• I recently received a file attachment from a close friend of mine regarding my son's scoliosis. The file is called Chi Quong - Exercises for a back, if anyone happens to know it. When I tried to open it in Windows Media Center, I wasn't really sure what to open it with. When I tried to open it in Microsoft Office Word, it prompted to select an option from the following, due to the document being locked by another user; to open a read only copy, create a local copy, or receive notification when the original copy would be available. I chose the first option. The program loaded for a little while, before prompting me to change the file's encoding. I chose the first option, (Windows), and then, as I looked through the assorted sheets, there was no English. The only thing that I could see was assorted symbols and squares. My question to you helpful and not so helpful souls is this;is there any way to open the file, or do any of you happen to know whatever this regime is enough to post it here?

• Answer:

  It sounds like you actually have a file named <name>.avi.part This usually means that the file did not completely download. You could try renaming to just <name>.avi and then opening it in a more liberal video player like VideoLAN VLC Media Player. Most likely it will only partially play if at all. You could also try to get your friend to resend the file.