May i know how do i create a .chm file? Preferrably a size whereby i could send it over my email account without any space constraint. In addition, is there a possibility to edit a current .chm file and dissect it into smaller chapters so that it would not constitute a large space thus facilitating sending over an ordinary email account.

If you're talking about MS help files then they can be extracted to html and then broken up into chunks from there:

Extracting to HTML
On Windows, a CHM file can be extracted to plain HTML with the command:
This will decompress all files embedded in filename.chm to folder extracted.
or by using HTML Help Workshop.
On Windows, as a hack, select the topmost Topic, right-click and select Print. On the popup dialog, select "Print this heading and all subtopics.", click OK. Before selecting a printer, look in %HOMEPATH%\Local Settings\Temp for a file named ~hh*.htm. This is the concatenated HTML. The image reference will refer back to the .chm file at the time of the "print".
On Linux systems which use apt as a packaging tool, a CHM file is extracted to plain HTML with (first command is for a Debian based OS)
Another useful set of tools for CHM files in non-Windows environments is the CHM Tools Package. It's available as source code, and includes a program, chmdump, which extracts the HTML from a CHM file into a separate directory.
It's also available for Mac OS X via MacPorts.
If MacPorts is installed on your system, you can type:
at a Terminal prompt to install the package. You can then extract a CHM file with:
source: wikipedia

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