CHM is an HTML help file for online helps. It is proprietary format from Microsoft. In CHM file a number of HTML help files are compressed, compiled and indexed. CHM files are used mostly as software manual. LZX compression technique is used to compress files in CHM format. There is a search option in this file. Moreover multiple CHM files can be added together.
RTF is a document file that supports several text formatting options. It is a proprietary file format of Microsoft. One of the drawbacks of RTF format is that it cannot contain or format any data, images, and diagrams other than texts. It can format the texts only.
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