![]() For example, certain types of encrypted data files, such as those used by home finance programs and some spreadsheet products, will not compress very much. There are other file types that don't compress well. ![]() Some document files, including those created by Microsoft Office, are actually Zip files with a custom file extension. Again, this is because the data in the original Zip file is already compressed. This second Zip file would not be substantially smaller than the first one (it may even be slightly larger). You would see a similar lack of compression if you zipped some files using maximum compression and then added that Zip file to another Zip file. Therefore, such files don't get much, if any, smaller when they are added to a Zip file (.zip or. Files that are compressed, as these examples are, usually cannot be compressed more to any significant extent. ![]() Examples include, but are not limited to, graphic (picture) files (GIF, JPG, PNG, etc), music files (MP3, WMA, etc), and movie files (AVI, MPG, etc). These file types usually employ efficient techniques to compress the data they contain. For example, most multimedia files will not compress much, as they already exist in a highly compressed state. There also are other types of files that often will not compress well. There are some other types of files, such as program files, that may compress by 50% or so. Certain data files, such as text files, picture files in the BMP format, and some text style database files can often be compressed by 90% or more. Some types of files compress better than others. CorelDRAW Graphics Suite 2021 (Windows/Mac).
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