Response from Erica Eshoo said:
I first tested on a few files that could not be compressed further
and in those cases it added to the overall size. A smarter utility
would have simply archived without adding more data.
Luckily I never use it to compress - only to decompress (and for
that it works wonderfully). But, what good is compression if it
doesn't compress?
Exactly. In the above cases it should have archived instead of tried
to compress.
How do you know it creates a larger compressed file than the
original?
By comparing the overall byte size of the files and the resulting
compressed archive. In the case of several images (4 if I remember
correctly) it added 17KB to the size. On an entire directory of
images (200+ I believe) it added almost 8 megabytes.
It was able to compress data that could be compressed but it did it
with generic ZIP compression -- not RAR.
If that is true, then I agree. A rar file should be whatever a rar
file is and not just a zip file with a rar extension. That's
pretty sly to say it creates rar files if what you say is true.
In fairness, I don't see anywhere where it says it CAN create RAR's.
Only that it supports them which is fair to say since it can
decompress them (with the aid of RAR Lab's UnRAR DLL).
Can anyone else confirm IZArc creates rar files merely by renaming
zip files?
To avoid confusion (and possible flames), I do not know if its EXACT
method is to create a ZIP then rename it to RAR -- I am saying that
it creates a generic ZIP file with a RAR extension.
Not too much difference but there are those who would argue
semantics.
One way you can verify this yourself is by creating a RAR file and
then actually using WinRAR to create a RAR file.
You'll notice that IZArc's RAR has the header "PK" whereas the true
RAR file will have the header "Rar!"