Alrighty then, I sort of fixed it by renaming the .xrns to a .zip. Reparing the .zip with WinRAR. Then extacting the SampleData folder and Song.xml to a folder, zipped those two files again and renamed the .zip to .xrns. Now I’ve sort of got it back again, just have to reload samples again. I love Renoise.
yes, this is the “standard” way to fix these issues. but please go in the preferences and enable the autobackup feature, it will save your coronaries