WinRAR defaults to maximum 4 MB dictionary I think, I'm not sure. The 7zip format of 7zip is much better than ZIP and even RAR in some cases, and you can use very big dictionaries and can use a lot of threads (for example with 16 threads and 1.5 GB dictionary, 7zip could use up to 145 GB of RAM to compress something, if you want absolutely the maximum compression on huge amount of data, like GBs of content) but that's ridiculous extremes. WinRar lets you choose between using the older RAR algorithms (until version 5) and newer algorithms which are not compatible with older rar decompressors. It's like the same story with RAR archives. the built in zip thing in Windows 7 opens the archive and shows the files in it, but can't extract a file compressed using the non-default algorithm PPMd (which is very very good at compressing text files or files with lots of words like html pages), the extraction fails with an error. simply choose from the compression method BZip2 or LZMA or PPMd 7zip supports those and also allows you to create such zip archives. WinZIP implemented several compression methods in ZIP files that are not using the standard DEFLATE algorithm. I'm not even sure it opens all non-standard zip files.
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