[Lazarus] Bug tracker file formats: 7z prohibited?

[Reinier Olislagers]

I noticed that in issue 22455, Bart Broersma says:
> Please don't use .7z as compress format, it isn't supported out of the box on many platforms. 

If we shouldn't use 7z files, which format should we use then? zip?
.tar.gz? AFAICT, these suffer from the same problems (e.g. no built in
support on Win98 platforms and/or various unix flavours)?

Thanks,
Reinier