If you're using the Microsoft/Windows/Office output option of Clipchamp that is creating videos that can be used in all versions of MS Office including PowerPoint and if output files you save to your computer are not saved as .asf but as .bin files, you can simply rename their file extension to .asf.
This will get Windows to recognise them as video files and they can be used in any Office application.
Here is an example: the video that Clipchamp produces after you select the "best for Windows" output option and that you save to your computer is called loony.bin. Just rename it to loony.asf in the Explorer window and it's ready to be used.
If you'd like to rename the file directly in the "Save File" dialogue when saving the video to your computer, here is how to do it: