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.
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