Cannot copy file

[Lighthouse]

I own a server and copied a php file to my domain.
With FlashFXP I want to make a copy from my domain to the harddisk of my workstation.

But when I transfer the file it reads:

Transfer failed and Permission denied.

I can copy any other (php)file except this particular file.
I also changed the attributes into 777 but this did not solve the problem.

I do not understand way.
Any help would be much appreciated!

Thanks!