1. A content preview system, comprising: a content feature analysis unit to analyze a content file for content features, wherein a weighted presence of respective ones of the content features in the content file is represented by a respective percentage value; and a preview type determination unit to: determine a relevance of respective candidate preview types to the analyzed content file as a product of at least the respective percentage value and a respective weight value of each of the content features, wherein the weight value of each of the content features corresponds to a respective relationship between the content features and candidate preview types, determine which of the respective candidate preview types has a highest relevance to the analyzed content file, and select, from among the respective candidate preview types, the preview type having the highest relevance as the preview type for the content file.