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How to determine if a DLL, UFL or EXE is 32 or 64 bit


The bitness (meaning 32 or 64 bit) of some files may be denoted by suffixing the filename, for example, MyFile32.exe or MyFile64.exe. However, this is not usually the case, especially with Crystal Reports UFLs and you may be wondering if the file is 32-bit or 64-bit.

Operating System: Windows

09-10-21     42 day(s) ago    

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Brant

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The easiest method to find out if a DLL, UFL or EXE is 32 or 64 bit is to open it in Notepad or another text editor such as Notapad++ . After opening the file in a text editor, use the Find option to look for the 1st occurrence of the word PE. The letters after PE header denote if the file is 32-bit or 64-bit.
· PE L = 32-bit (x86)
· PE d† = 64-bit (x64)


Another method is to use SigCheck from Microsoft SysInternals. Use the command line to run this utility on the file and look for MachineType: 64-bit or MachineType: 32-bit in the output.

The location of system files in the Windows Directory structure can seem counterintuitive. On a 64 bit system the 64 bit DLL files are in the System32 folder, and 32 bit DLLs are in the SysWOW64 folder. Additionally, 32 bit programs are in Program Files (x86) and 64 bit programs are in Program Files.

Posted 42 day(s) ago

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