Why do not use strtofile() and filetostr() to concatenete files?

>I need to combine multiple reports (.frx's) into one 'batch'. I have thought about making a single pdf file or appending to a .prn file, but I wanted to know if anyone had done this before and what solution was they used.
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>The reason - I need to fax all information at the same time - currently the user can fax, but the result is several faxes being sent instead of just one.