How do i change my video format?

i just made a new video that i want to put on youtube but when i upload it says this video is a windows movie maker format and that i need to change it to wmv format how do i do that.How do i change my video format?WMMaker video editing process:

*.mswmm is a WindowsMovieMaker Project file extension

鈥tep 1. Capture/Import files to be used

鈥tep 2. Edit - drag/drop files-%26gt;timeline; enhance w/ effects-transition-titles-filters

鈥tep 3. Finish (w/render) Movie- save file or share-burn to CD

*.mswmm is a file extension (NOT a video format) of saved WinMovieMaker PROJECT, a 'work-in-progress' w/c archives links to various video/pic/music/etc. files collected %26amp; also those included in timeline. If the editing process cannot be finished in one session, the process can continue later starting with this *.mswmm file. Also, this allows for multiple re-edits if still not satisfied. This file is not even recognized by WMM as a valid file for capture.

Save Project is true for most if not all video editing app so as to have just a small file to save on disk space when the pc is not used for editing. It is next to impossible to finish a movie in just one sitting.

If there was no .avi or .wmv file, it would mean that Step 3- Finish Movie- SAVE TO MY COMPUTER (w/rendering) was not done. OR the editing process could have been finished but the .avi or .wmv file could not be located. In Step 3, WMM allows the user to type a filename, the destination folder and choose the format %26amp; resolution of final muvee.

Hope you have not deleted or moved the files used in editing, just double click on the *.mswmm file and the project will re-appear. Complete the 3rd step- save w/ desired format/ resolution... and you're ready to test your final muvee, then upload %26amp; share.