All file transfers are included in this metric. This includes automatic downloads, such as icons for channels, server- and channel groups.
see above
Only files uploaded by the administrator are downloaded automatically. Files uploaded by users need to be downloaded manually.
The TeamSpeak server has some default icons; the administrator supplies all others.
I don’t think the download of icons is logged. You can find the files in the client’s cache and inspect the last modified date. The cache is located under %localappdata%\TeamSpeak\Cache\Default on Windows. There is a folder containing some hex digits for each server you connected to.
As mentioned above, only icons are downloaded automatically. They are stored without extensions in the cache. Good operating systems can handle files based on their contents. For Windows, you need to specify the extension to open them.
If I’m not mistaken, icons are hard cached. So you need to clear the cache for the client to download them again.
The server only stores the quota usage based on your identity. I don’t think uninstalling removes the cache (as with most programs). So reinstalling will not make the icons be downloaded again.
It does not matter which TeamSpeak installation you are using. Quota is stored on the server per identity.
To my knowledge, user-sent files (file transfer and myTS attachments) are not scanned. Icons need to follow specific requirements, so there is a really low likelihood of malicious files.
