The official Windows 10 Media Creation Tool allows you to download the latest version of Windows 10 ISO from Microsoft. Whenever you want to perform a clean install of Windows 10, it’s a good idea to download the latest version and install the same. At times, you might come across a previously downloaded Windows 10 ISO on your PC, but you are not sure about the build number of it. How to check the build number, version info, and architecture of (32-bit or 64-bit) of Windows 10 ISO without installing it? Fortunately, there is an easy way to figure out the build number and other details of Windows 10 ISO. You just need to mount the ISO file and execute a command to know the build number and other details of the ISO file. Figure out Windows 10 ISO build number and Architecture Complete the given below directions to check Windows 10 ISO edition and build number. Step 1: On your PC, navigate to Windows 10 ISO file, right-click on it and then click Mount option to mount the ISO file in the File Explorer. You should now see a new drive in “This PC.” Open up the new drive (which includes your ISO file contents) and navigate to the Sources folder. Here you will find a file called Install.WIM or Install.ESD. Note down the path to Install.WIM or Install.ESD. And if you cannot find the Sources folder in the root of the drive, please open x86 or x64 folder to see the Sources folder. If the ISO contains both 32-bit and 64-bit Windows 10, you can find the Install.ESD or Install.WIM file by navigating to x86sources or x64sources folder. TIP: To copy the full path, hold down the Shift key, right-click on the file and then install Copy as path option. Step 2: Next, open Command Prompt as administrator. The easiest way is to type CMD in the Start/taskbar search field and then simultaneously press Ctrl + Shift + Enter keys. Click Yes button when you get the UAC prompt. Step 2: In the Command Prompt, execute the following command: dism /Get-WimInfo /WimFile:E:sourcesinstall.esd /index:1 Use the above command if you have install.esd file in the ISO. Or dism /Get-WimInfo /WimFile:E:sourcesinstall.wim /index:1 Use this command if you have install.wim file. Don’t forget to replace “E:sourcesinstall.wim” with the actual path to the install.wim/esd file. As you can see in the picture above, the command fetches details such as the version number of Windows 10 which includes the build number of Windows 10 (last five digits indicate the build number), architecture, ISO created date and some other not so exciting details. The command doesn’t fetch the actual version of Windows 10 ISO, but you perform a web search using the build number to get the version number. For instance, the build 17134 belongs to version 1803 of Windows 10. Please note that Windows 10 ISOs usually include more than one editions. You can change the index number between 1 and 6 to know all editions in the ISO. For instance, if you use index “6”, you will get Windows 10 Pro edition details. You may close the Command Prompt now. Step 3: Finally, right-click on the mounted drive in This PC and then click Eject to unmount the ISO. How to check if Windows 10 ISO is bootable guide might also interest you.