missing ext on saving

[Flatlander2000]

**CPod version:**v1.27.0

**Platform:**Win10

Installation type (.deb, Snap, etc.):
.exe

Description:
When I download a podcast episode to a custom folder (e:\media\podcasts for example) the files are not assigned an extension.
They should be given *.mp3 but this is missing.

Thanks. Awesome program.

Version of CPod which introduced the issue (if applicable):

Steps to reproduce:

Other information (e.g. Developer Tools console log, screenshots) if possible:

[TauZero51]

I'd like to highlight this issue as well. It's no big deal to add the mp3 extension manually, but other podcast progs do so automatically. In all other respects, CPod gets full marks for its attractive interface and simplicity of use. Thank you!