Probably a small change request which can improve usability a bit in specific circumstances.
If in a appointment preview the file for the download has no file extension, zammad should fall back to handle it as a ics-file therefore a manual renaming of the file to open it with the the default application would be obsolete.
We have seen this behavior in Teams appointments which results in a file with no extension while trying to download it.
And when you press download file it will be downloaded without the .ics extension so you have to rename it before you can open it in your calendar app. Your suggestion is, that it will be downloaded directly with the .ics extension so that it opens directly in your calendar app?