In windows 8 right clicking a file and clicking Shred With Bleachbit results in the file not being deleted and a "Check %program files% for log" message but no log is generated.
edit 1: Log generated says "bleachbit.exe: error: no such option: --no-auc"
edit 2: changing BleachBit in windows 8 to always Run with Admin privileges allows it to work only if changed to the below
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AllFilesystemObjects\shell\shred.bleachbit\command]
@="\"C:\\Program Files (x86)\\BleachBit\\bleachbit.exe\" --gui --shred \"%1\""