Video question

[Fliegenmong]

Have a really neat little spy cam that Jnr Fliegs and I tape to the side of model A/C, results are terrific, but I cannot find out how to put them on to You tube. I think it was an .AVI file (?), and someone told me that Windows XP movie maker can change that to a .MPEG (?) which is something that you tube recognises, so Jnr Fliegs knows about movie maker, but seems to have only managed to change the file to a .MSWNM (?), and this does not work. So, given the thousands of videos on youtube, how do I get one on?

Edited to say I am trying again and the file appears to be '.MSWMM', but I did see Jnr Fliegs "save as" .MPEG - I thought just because you type .MPEG at the end does not mean it necessarily mean it is an .MPEG (Whatever the Frig an .MPEG is) so how do I do this I.m getting very frustrated by this