Are there any free file converters that will do all these...?

Convert wma files to wav files with good quality, so easy, you just need to use a right software. you can try RZ Audio Converter, it can convert any audio files between different formats with good quality, such as convert wma files to wav files, etc. convert flv files to avi or wmv files, you can try RZ Video Converter, it can convert any videos and audios between different formats with good quality, such as convert flv files to avi or wmv files, etc. you can yahoo or google search and download RZ Audio Converter and RZ Video Converter, both easy to use, hope my info can help you!