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Windows Portable Executable: determine if 32 or 64 bit

A Windows Portable Executable (EXE or DLL) is (nowadays) either compiled for execution in 32 or 64 bit environments. Which it is can be determined, for example with dumpbin.exe /headers xyz.dll. Because its output is rather noisy, the output might be filtered with findstr:

C:\> dumpbin /headers xyz.dll | findstr /c:"machine (x"
C:\> dumpbin /headers xyz.exe | findstr /c:"machine (x"

If the output is something like 14C machine (x86), the Portable Executable was compiled for 32-bit, if it is something like 8664 machine (x64), it was compiled for 64-bit.

Using Task manager

The task manager shows if a running process is 32 or 64 bit in the tab Details, column Platform (which must be added when task manager is started the first time).

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/Windows/...', 1788414556, '216.73.217.21', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Windows/development/Portable-Executable/determine-32-or-64-bit(52): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78

Windows Portable Executable: determine if 32 or 64 bit

Using Task manager

See also