File under ‘m,’ for ‘mom’

The long-rumored return of “The X-Files” to the silver screen seems as elusive as some of Special Agent Fox Mulder’s alien theories.

The truth is out there, but Gillian Anderson – like her facts-first character, Special Agent Dana Scully – wants to see it in writing.

“I’m waiting for a script to be delivered,” Anderson says. “It’s apparently in the works, but I’m not sure until such time as there is a script. We all want it to happen.”

Anderson starred with David Duchovny in the Fox TV series from 1993 to 2002, as well as the 1998 film, “The X-Files: Fight the Future.”

Now living in London, she recently visited Grand Rapids, Mich., where she spent her teen years, to celebrate the 90th birthday of her grandmother and show off her 6-month-old son, Oscar.

She also spoke at a fundraiser for neurofibromatosis, a genetic disorder that causes tumors to form on nerves. Anderson’s brother, Aaron, who is working on his Ph.D. at Stanford, has been diagnosed with NF1, a moderate form of the disease.

Neurofibromatosis is one of many charities Anderson supports, including a variety of causes in Africa, from AIDS to artists to elephants.

“It’s an unexpected benefit of celebrity,” she says. “I discovered the benefits of someone who is in the public eye pointing attention to something that needs attention.

“Over the years, ‘X-Files’ fans have donated money and gotten involved in raising money and started to volunteer because they see me volunteer.”

Among other things, Anderson and her fan following have raised money for a school in Uganda. She speaks excitedly about getting the school on the electric grid, or raising enough money for a borehole so the community can have fresh water.

Although Anderson moved to London (where she lived from ages 2 to 11) five years ago, she has remained visible to American audiences, earning an Emmy nomination for her portrayal of Lady Dedlock in Masterpiece Theatre’s “Bleak House,” which aired on PBS in 2006 and repeated in recent weeks.

She also had a supporting role in last year’s Academy Award-winning movie, “The Last King of Scotland.”

But several of her British films, such as “The Last Celt” and “Tristram Shandy: A Cock and Bull Story,” never made it to many U.S. theaters. Anderson suspects that will be the fate of “Straightheads,” a horror thriller in which she has a nude scene, which opened April 27 in the U.K.

Anderson didn’t work during her pregnancy and has been able to stay home with Oscar, her son with businessman Mark Griffiths.

It has been much calmer than the high stress she felt when daughter Piper, now 12, was born in the midst of filming episodes of “The X-Files,” she says.

“Being home with him has been very different,” she says, “and I recommend it.”

The birthday bunch

Actor Kevin Conway (“Gods and Generals”) is 65. Actor Anthony Geary (“General Hospital”) is 60. Composer Danny Elfman is 54. Singer LaToya Jackson is 51. Actress Annette Bening is 49. Actor Rupert Everett is 48. Singer Melissa Etheridge is 46. Actress Lisa Whelchel (“The Facts of Life”) is 44. Singer Melanie “Scary Spice” Brown (Spice Girls) is 32.