High Court judge Johnson Lam said last month a will in the possession of Chan was a fake, and ruled in favour of a rival claim to the eccentric billionaire's estate by a charity now run by Wang's siblings.

"We have filed an appeal this morning laying out the grounds of our action," a spokeswoman for Chan said.

Chan, who claimed to be Wang's long-time lover, argued in his appeal documents that the judge committed errors in his analysis and did not back up his conclusion that the will was fake, broadcaster RTHK reported.

The 50-year-old is out on bail worth five million Hong Kong dollars (640,000 US dollars) following his earlier arrest by the police on suspicion that he forged the will.

Wang, who was at one stage was Asia's richest woman, died of cancer in April 2007 at the age of 69, triggering a bitter feud between Chan and the charity both claiming they were entitled to her massive fortune.

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