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I'm compiling a program on my 64bit machine, but I'm not sure if it produces 32-bit or 64-bit output.. How can I check if a file is 32bit or 64bit on Windows?
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Just run it and have a look at the Processes tab in Windows Task Manager. If there is a *32 suffix after the process name, it's 32-bit, otherwise it's 64-bit (provided you're on a 64-bit OS).
Open the .exe file using Notepad to check its headersThe letter that follows the PE header tells you if the file is 32-bit or 64-bit. 32-bit (x86) programs would have PE L as the header. 64-bit (x64) programs would have PE d† as the header.
You can use GNUfile for windows.
You can run the app thru PEID
Lastly (and preferred- less room for error)
With either Visual Studio C++ (at least express edition minimum) or the Platform SDK installed you can use dumpbin /headers to look at the PE header values.
The first value in the file header tells you the architecture: either 0x14C for x86 or 0x8664 for x64
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Just run it and have a look at the Processes tab in Windows Task Manager. If there is a *32 suffix after the process name, it's 32-bit, otherwise it's 64-bit (provided you're on a 64-bit OS).
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