Source: http://hkmdb.com/db/movies/view.mhtml?id=4490&display_set=big5

Please explain why you believe The Dark Heroine Muk Lan-fa is the original title.

I originally made this entry. I accidentally forgot to put the original title in Chinese and instead had The Dark Heroine Muk Lan-Fa. The Black Musketeer was an alternate title I put down. The admin that edited my mistake and instead changed that to the original title.

I can also read some Chinese, and the original Chinese could easily be translated as 黑(Dark) 女俠(Heroine/Female Hero) 木(Mu) 蘭花 (Lan-Fua). This is title screen.

Other than that, my reasons are that it was on VCD in China under that title, and it's the title on the Hong Kong Movie Database. Here's another reviewer as well with the title: http://tarstarkas.net/2011/11/the-dark-heroine-muk-lan-fa/

According to the catalogue entry of this film at the Hong Kong Film Archive, the original title is The black musketeer 'F' (source: https://mcms.lcsd.gov.hk/FAMS_ipac/cclib/search/showBib.jsp?oai=Y&f=e&id=655371410662405).

The translated title is "The dark heroine Muk Lan-fa" (see link above).

But according to the HK Movie Database (source: https://hkmdb.com/db/movies/view.mhtml?id=4490&complete_credits=1&display_set=eng)

The Dark Heroine Mu Lanhua Alias: The Dark Heroine Muk Lan-fa Alias: The Black Musketeer 'F'

"The Dark Heroine Mu Lanhua" is the original title. As this is a Cantonese film instead of Mandarin film adapted from a Hong Kong (Cantonese) story by Ni Kuang, may be Muk Lan-fa (Cantonese) is more appropriate than (Mu Lan-fa).

So I think referring to the HKFA title (The Black Musketeer "F"), the HKMDB one (The Dark Heroine Mu Lanhua), or the Cantonese one "The Dark Heroine Muk Lan-fa" are all fine. But "The Black Musketeer" (current form) has missed out the "F" ...