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Previously, I would look in Task Manager for a *32 next to the process name in Task Manager to tell what platform the process is running on:

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However, in Windows 8 and 10 (on the details tab) this is not present:

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How can I see, in Task Manager, if my processes are running as 32-bit or 64-bit?

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Task manager in my Windows 8/10 has always displayed (32 bit) beside the app names, no changes is required to see the platform winaero.com/blog/wp-content/uploads/2015/10/… – Lưu Vĩnh Phúc Mar 19 at 16:09
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You are looking at different tabs...within task manager – Ramhound Mar 19 at 16:40
    
@Ramhound True, but as the "details" tab is closer to the functionality of the earlier Windows "processes" tab, this is what I prefer to use for all the details to be displayed (as the name implies). – Jonno Mar 19 at 16:47
  1. Right click on the column headers and click Select columns

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  1. Check Platform

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  1. Drag the new column where you want

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switch to Processes tab and you'll see the platform in the app name – Lưu Vĩnh Phúc Mar 19 at 16:12
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@LưuVĩnhPhúc Definitely a fair point - My preference is the Details tab as it's a lot more comprehensive and uses less space, but I didn't specify that in the question. Thanks though, you're right, it's definitely there in the other tab. – Jonno Mar 19 at 16:30

How can I see, in Task Manager, if my processes are running as 32-bit or 64-bit?

You can use an alternative Task Manager, for example Process Hacker (free, open source, can replace Task Manager and there is a portable version).

Bits can be added as a column to the normal detailed "Process" display:

enter image description here

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