Extension .txt.pgp to target file in receiver file communication channel

Dear Experts,

I need to create a file with extension .txt.pgp. But when i give this extension in target file name in channel to produce TEST_Action_.dat.pgp with time stamp.

Result file name comes as TEST_Action_.dat20161030101030.pgp where as i want TEST_Action_20161030101030.dat.pgp

Can any body guide me please?

Thanks.

Sumeet.