How to find if native dll is compiled as x64 or x86?

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You can use dumpbin too. Use the /headers or /all flag and it's the first file header listed.

dumpbin /headers cv210.dll

64-bit:

Microsoft (R) COFF/PE Dumper Version 10.00.30319.01Copyright (C) Microsoft Corporation.  All rights reserved.Dump of file cv210.dllPE signature foundFile Type: DLLFILE HEADER VALUES            8664 machine (x64)               6 number of sections        4BBAB813 time date stamp Tue Apr 06 12:26:59 2010               0 file pointer to symbol table               0 number of symbols              F0 size of optional header            2022 characteristics                   Executable                   Application can handle large (>2GB) addresses                   DLL

32-bit:

Microsoft (R) COFF/PE Dumper Version 10.00.30319.01Copyright (C) Microsoft Corporation.  All rights reserved.Dump of file acrdlg.dllPE signature foundFile Type: DLLFILE HEADER VALUES             14C machine (x86)               5 number of sections        467AFDD2 time date stamp Fri Jun 22 06:38:10 2007               0 file pointer to symbol table               0 number of symbols              E0 size of optional header            2306 characteristics                   Executable                   Line numbers stripped                   32 bit word machine                   Debug information stripped                   DLL

'find' can make life slightly easier:

dumpbin /headers cv210.dll |find "machine"        8664 machine (x64)