Do u want to send a file which has larger size or send a executable program files ?

U know that it is not possible to send a file of a larger size or executable files as attachments in email.
so use a online storage media like Google drive , Skydrive ........
which allows you to upload files of larger sizes or executable files or any software and share the link of uploaded file (privacy : public or private....) with ur friends.
Now the uploaded file is readily available for download depending on the privacy settings of the file.