how to decrypt messages to hidden recipient

[Anonymous]

hello,

I would like to decrypt messages stored in a folder:

folder
1 2 3 4 5...n

All messages are encrypted to hidden recipients.  I have only one key
which I want to be trying to use.  

How can I try to decrypt all the files in the folder trying my
specified secret key?

For instance
for each file in folder
	try to decrypt file with key k
	if decrypted, display
	else, continue