Total CHM file size is 815,211 bytes (6B 70 0C hex), four bytes, little-endian order, at offset 8 in the section (or offset 0圆8 from the beginning of the file). Next to the initial header we see Header Section 0, starting from signature 0xFE 0x01. Initial header total size is 96 bytes (4 bytes at offset 8, little-endian, hex: 60 00 00 00). Version check confirms that it is a valid CHM file v. When inspecting example.chm file's binary data using any Hex Viewer, like Disk Editor we can see it starts Is located at offset 8 at this header section, 4 bytes, little-endian order. It has a signature 0x01 0xFE, and CHM total file size Next to the initial header is located Header Section 0. Initial header size is defined at offset 8: 4 bytes, little-endian order (lowest byte first). This is followed by the header section table and the offset to the content.įile version is in initial header - four bytes at offset 3, little-endian order. Microsoft Help CHM files start with a signature ITSF (characters 'I','T','S','F' or bytes 0x49, 0x54, 0x53, 0x46).Įxcept signature, it begins with a short initial header (56 bytes). CHM Signature Format: Specification & CHM Recovery Example
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