The 28-year-old man was detained after the two handguns, along with ammunition and a Koran, were discovered in his bag during a routine security check at the New York Hotel in the theme park.
According to a statement released by the prosecutor's office in the city of Meaux, the man risks up to five years in prison and a fine of 75,000 euros.
But prosecutors have already said the man is not suspected of any terrorism offences.
The incident comes as France remains on high alert after the November 13 attacks that left 130 people dead and hundreds wounded.
According to a police source, during questioning the man said he had been carrying the guns – two small calibre automatic pistols – because he did not want to leave them at his mother's home where he was living.
Another police source, however, said the man initially told officers he had been armed because he feared for his own safety.
The man's girlfriend was also taken in for questioning on Thursday but prosecutors said they were satisfied that she was not incriminated in any wrongdoing.
- with AFP