Hi there,
I am sure Avast detected a false positive, please see VirusTotal results for the open-source audio player Quod Libet:
I was unable to upload a sample to Avast Labs because I got this error message:
‘413 Request Entity Too Large’
You can download and test the installer using this direct download link:
https://bitbucket.org/lazka/quodlibet-files/raw/default/releases/quodlibet-3.2-installer.exe
Quod Libet Home Page:
https://quodlibet.readthedocs.org/en/latest/
Regards,
Asen