It looks like that wve to avi conversion is mainly related to export of Wondershare Video Editor projects (.wve files) to AVI video format. You can achieve this only using Wondershare Video Editor and perhaps also in its successor product Filmora.
Cyberlink PowerDirector also uses .wve files for their projects and these might be exported to AVI format as well, but this is completely different conversion as these two WVE formats are not interchangeable.Open WVE file Open AVI file
Suite of tools for video editing
All-in-one home video editor
All-in-one home video editor for Apple Mac
A discontinued video editing software replaced by Wondershare Filmora