Again investigating AutoCAD r14 app under wine, I found a bug that make app hang when some registry values are present. At first I've made a script that cleans up registry before launching AutoCAD,but this was only a way-around to the problem. Looking at relay output, I found a loop in calling RegEnumValueA : // @@@@ START OF LOOP BLOCK HERE......... :Call advapi32.dll.RegEnumValueA (000000cc,00000001,40486844,404868ec,00000000,404868f4,41e62020, 404868fc) ret=008a3850 :Call ntdll.dll.NtEnumerateValueKey (000000cc,00000001,00000001,40486544,00000100,40486540) ret=406afb24 :Ret ntdll.dll.NtEnumerateValueKey() retval=00000000 ret=406afb24 :Call ntdll.dll.RtlUnicodeToMultiByteSize(4048653c,40486558 L"REGPATH\\\\HKEY_LOCAL_MACHINE\\Software\\Autodesk\\AutoCAD\\R1 4.0\\ACAD-2452448:80143967\\AutodeskApps\\LsObj",0000000e) ret=406afc03 :Ret ntdll.dll.RtlUnicodeToMultiByteSize() retval=00000000 ret=406afc03 :Call ntdll.dll.RtlUnicodeToMultiByteN (40486844,00000007,00000000,40486558,0000000e) ret=406afc24 :Ret ntdll.dll.RtlUnicodeToMultiByteN() retval=00000000 ret=406afc24 :Call ntdll.dll.RtlUnicodeToMultiByteSize(40486538,40486566 L"\\\\HKEY_LOCAL_MACHINE\\Software\\Autodesk\\AutoCAD\\R14.0\\AC AD-2452448:80143967\\AutodeskApps\\LsObj",000000bc) ret=406afc77 :Ret ntdll.dll.RtlUnicodeToMultiByteSize() retval=00000000 ret=406afc77 :Call ntdll.dll.RtlNtStatusToDosError(80000005) <--ERROR HERE ! ret=406afd5d :Ret ntdll.dll.RtlNtStatusToDosError() retval=000000ea ret=406afd5d :Ret advapi32.dll.RegEnumValueA() retval=000000ea ret=008a3850 <-- MORE DATA AVAILABLE RETURN (AUTOCAD KEEPS TRYING TO GET DATA) // @@@@ END OF LOOP BLOCK HERE Here RegEnumValueA returns an error of invalid buffer; Looking into code it seems to me that the NtEnumerateValueKey() used to find the largest name and value sizes of keys to be enumerated returns a wrong size; next use for reading the key gives an arror of buffer overflow, being it allocated with wrong (too small) size. AutoCAD keeps trying to get the keys/values, in and endless loop. Looking more with some debug print statements, it appears that Autocad allocates 4 bytes of buffer for the value, but RegEnumValueA needs much more, 94 in this case, giving an Out-Of-Buffer error back. It seems to me that the 94 bytes are for the name of the key, not for the value.... Regards Max