I got you, in the world "file" I guessing that you means to activation.
Download the file "samp.exe." from the main website - This is the main download that has been created by the SA-MP Team, http://files.sa-mp.com/sa-mp-0.3e-install.exe. So as stated before just switch the file 'samp.exe'.
I very hopes that I helped you, have a nice day.