"Dossier" is masculine in French. So it is "un dossier."
Dossier is a noun.
The Miernik Dossier was created in 1973.
Dossier Journal was created in 2008.
He compiled a dossier of evidence to present to the court.
The James Bond Dossier was created in 1965.
Dossier K. was created on 2009-12-09.
Lucent Dossier Experience was created in 2004.
A Praed Street Dossier was created in 1968.
(dossier basically means "a file which contains information regarding a subject or person") The police had amassed a sizable dossier on the master criminal. She realized that the detective she had hired was compiling a dossier on her as well.
A Praed Street Dossier has 108 pages.
Digital Dossier is an accumulation of digital tracks you have left behind on your computer