I just skimmed through the entire 4 pages of this thread looking for an answer to the following question, but if it's there I must have missed it. Sorry.
Is there a particular reason why you switched from 7-zip to IZARC? The only reason I saw why you didn't use 7-zip was because one person said he had a client that wouldn't install 7-zip on their machine.
I have (for example) a 232 MB file and when I use SpinZip to compress it with maximum compression (9) it brings it down to 110MB (47% ratio), which is great, but with 7-zip (.7z) on Ultra compression it goes down to 89 MB (38% ratio). I know that 20MB isn't a lot, but if you're talking about 20MB * 100s of files, it can add up to be GBs in saved HDD space.
I would like to request at least an option
to compress to the .7z format to take advantage of the better compression ration 7-zip offers.
EDIT: Naturally almost immediately after I posted I found the answer:
I was wondering if you could make a version and add .7z support? Like have an option between .zip and .7z.
I had originally tried using the 7z binary for the backend but there were some things that it couldn't do easily (exactly what escapes me at the moment...it's been a while so that's why I switched over to the IZarc binary. Unfortunately, the IZarc command-line binary cannot make 7z files (though the main IZarc application can).
Still, some part of me hopes that perhaps the 7z binary has improved in the past 3 years
to make my request more likely of happening.