Confirming the problem with beta version in x64. But have found the bug.  In 3.3.14.5 the definition of the TAG is Global Const $tagEDITSTREAM = "align 4;dword_ptr dwCookie;dword dwError;ptr pfnCallback" While in beta 3.3.15.3, it is  Global Const $tagEDITSTREAM = "struct;dword_ptr dwCookie;dword dwError;ptr pfnCallback;endstruct" Which in 64 bits is misaligning the structure.  It needs to be align as 32bits. Just change the definition of the tag in the 3.3.15.3