How do I transfer .com files to my customers

I write software that when completed creates a group of 10 files which I move into a folder. All of these files can be emailed to my clients via email except for the program or .com file. I purchased 200 thumb drives that can hold this folder and then mailed. Even though I used thumb drives with about 1/4 gig capacity this can get expensive. I have not been able to email .com files and even...