Ahem...

May I interfere in the matter???
Well I would like to say something to you guys:
@ The Texan : Well ... excatly speraking you might have called him a CRACKER at once...he is asking all such questions..like cracking programs and seems like he is intersted in trojaning some of his friends prpbably. I feel pity and sad when I see HACKERS being pointed as COMPUTER CRIMINALS...which they are not. Please use the right word.

@ nihil : I think you are right to the point when you ask Install or RUN. On my part I think that it might be INSTALL...he is trying to figure out how to alter a program on a rempte computer (or add another one at startup) so that he is able to communicate thru the backdorr as and when he wishes to do....and that surely will need an INSTALL.

And by his question of making a program identical to some other file of other extension....I think that pretty much resembles the question of rock_bill who asked how do non-exe files infect the PC...is he the same person??? And I think that nihil is right.

@ sec_ware : can you explain me that what do you mean when you say "yes you can open a program in notepad by renaming it to a TXT file and opening it. I think this is an answer to the question like this : How do I look at the RAW executable code of a program..

By the way... it was sometime ago I was tryingf to mount a drive in Linux and failing aeverytime when I opened my "My Pictures" folder of windows and saw that there were pictures in the folder with another extension...Linux opened them calling them JPG. So I think that Linux doesnt care for extensions but for SIGNATURES??? Am I right???