How to split a big sized file for sending on email and how to merge the splitted file at the destination PC?

Answer 1

Use Google. Search for "Windows File Split Program". (Unless you're running Linux, in which case, search "man split").

Here are some programs that will do what you want.

http://www.spadixbd.com/freetools/jsplit.htm
http://www.pcworld.com/downloads/file/fid,6938-order,1-page,1-c,filemanagement/description.html
http://www.pc-tools.net/win32/filesplit/
http://www.gdgsoft.com/gsplit/

The bottom one seems best to me.

Answer 2

You, the sender, can select "x" number of pages and save to filename_part1 and select another number of pages and save to filename_part 2.

All the receiver has to do, providing he/she has the same software, is open a blank document and insert the two parts, then save.

Of course if you had a zip file you could zip it.