Ok so i have an song file that wont load and gets that message.Been working on this one track a lot over a few weeks,so im pretty bummed out,any help??
copy the .xrns to a .zip file and then have a zipfix utility process it.
In a lot of cases, it can still resurrect the song.xml file which is your most important data. After the fix, renamed the extension of the fixed zipfile back into .xrns and try to load it in Renoise.
Thanks a lot for all the help,i will try that and let you know how i got on,cheers! 
Did you had any success recovering this song Toybox?
Sorry dude havnt tried it yet,was working on sumthin else since then,will try it out tonight and let u know 2moro,thanks again for the help,i really appreciate it