On Sunday 19 March 2006 22:05, Davis Pyon wrote: > It's because the 64bit dll is called csound64.dll in 5.01. > In version 5.00, it was called csound.dll. I assume by '5.01' you mean the .zip package, which in fact always had csound64.dll and not csound.dll ? I do not know if the the file name is changed in the 5.01 .exe release, since that is apparently not available yet; nevertheless, the Feb 25 beta that is still on SourceForge contains csound.dll.