For customers in Europe:

http://support.sony-europe.com/DNA

For customers in Latin America:

http://www.sony-latin.com/index.crp

For customers in the U.S.A.:

http://www.sony.com/recordersupport

For customers in Canada:

http://www.sony.ca/ElectronicsSupport

For customers in other countries/regions:

http://www.sony-asia.com/support

Note that recorded files may be deleted during service or repair work.