The website called on the Indian government to approach the government of Japan regarding a DNA test of the remains of the freedom fighter which are believed to be preserved at Tokyo's Renkoji temple since September, 1945.
Bose is believed to have died in an air crash in Taiwan on August 18, 1945.
"A DNA test could end the controversy over Bose's death once and for all," www.Bosefiles.Info said in a statement.
The letter, declassified by Prime Minister Narendra Modi last month and posted among the National Archives' files under the heading of Netaji Papers, reveals Ray pleaded with Rao for a DNA test of the remains at Renkoji temple.
After that and following telephonic contacts with British and American DNA testing organisations, on September 21, 1995 Ray apprised then external affairs minister Pranab Mukherjee on the issue.
Ray forwarded this note to Professor Anita Pfaff, the Germany-based daughter and sole heir of Bose.
Thereafter, Ray sought out a son of one of Bose's sisters - the late Shanti Kumar Dutt - who was willing to fully cooperate regarding a DNA test, the website notes.
