Como você está olhando para isso? Sysinternals mostra 64 bits.
PS C:\Users\John\AppData\Local\Temp\httpd-2.4.26-Win64-VC15\Apache24\bin> sigcheck.exe .\httpd.exe
Sigcheck v2.54 - File version and signature viewer
Copyright (C) 2004-2016 Mark Russinovich
Sysinternals - www.sysinternals.com
C:\Users\John\AppData\Local\Temp\httpd-2.4.26-Win64-VC15\Apache24\bin\httpd.exe:
Verified: Unsigned
Link date: 05:05 2017-06-14
Publisher: n/a
Company: Apache Software Foundation
Description: Apache HTTP Server
Product: Apache HTTP Server
Prod version: 2.4.26
File version: 2.4.26
MachineType: 64-bit