OK I have tested on my Nokia 770 with filenames that have accented characters.

Basically if you transfer an accented audio file to your Nokia 770 for example using the USB cable, the file will reside on your Nokia with an accented filename.

Then if you view the Artist, Album, Track in Canola, you will perhaps see strange names that represent the various accented tags within file.
(Canola is viewing the tagging information for Artist, Album, Track but in some cases misinterpreting the tag information, which is also an underlying OS problem?)

Now when you try to play the track, it will not be played! However if you remove/replace the accented characters from the filename it will be played in Canola.
(Although the tagging information may/will still be screwed)

ALL TO NOTE: Playing the same files in OS 2008 on the Nokia N800 or N810, both the accented and non accented file are read and played, but the accented characters are still replaced and in some cases screwed up! This occurs with both Canola and built in Media Player, where I use musicbrainz to tag my files with id3v2.3 tags. Nokia need to fix this, where I would imagine a bug has now been raised on OS2006, 2007 & 2008 Maybe one day soon it will be fixed and Nokia will advise us

---edit---

So to explain the visual name issue in Media Players a little further I will use the accented track I used as an example on my Nokia 770, N800 & N810.

i.e. My Music\Alejandro Sanz\Más\Corazón partío.mp3

Filename renamed from Corazón partío.mp3 to Corazon partio.mp3 before transfer to Nokia 770 to ensure track would actually be played in Canola on OS2006/2007HE.

In Canola and Media player on OS2006, 2007, 2008 the Artist, Album, Track name are seen via tagging as Alejandro Sanz, Mas, Corazsn partmo
quite different to the Album name of Más and actual track name of Corazón partío

Note how the accented characters are being replaced, and in some cases incorrectly replaced by the OS etc.

This is my layman's explanation of the symptoms as "unicode this or UTF-8, UTF-16 that" not to mention "ID3v1, v2 and then V2.3 V2.4" is just gobbledygook to many people.

The following two screen grabs taken from my N810 with latest OS2008 installed to illustrate the problem clearly in both Canola2 beta and built in Media Players.





To be sort of aligned with Flickr Community Guidelines, link to my recent Flickr Photos http://www.flickr.com/photos/83537107@N00/