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[Ozzie]

Afaik every registered user has access to the ISO cellar from the start. Wasn't this changed just recently?
I see no reason to change every archive to a different standard, but I see a reason to at least add support for 7ZIP. If I didn't, I wouldn't bother! Of course, I don't know how big a problem it is to add the support, since I'm not well versed in such technical issues.

Maybe when archive sizes get too big to manage and people use formats such as .7z (another programme we would have to support on the user-end, which we can really do without since we have our hands full with dosbox as it is, most of the time) a lot more and server costs get prohibitive for less compressed archives...

I really don't understand this insistence (I heard it before...) on having to support another program on the user's end: WinRAR already supports 7ZIP like countless other unarchivers! Only WinZIP doesn't, as a notable exception.
Even if WinRAR didn't: ZIP is also supported by 7ZIP of course, so then it would be just an issue of changing the support to another program.

In the end, the only grave problem I see is the lack of support from the site code of Abandonia for 7ZIP. And I guess until this happens any further discussion is futile anyway.