Most modern systems have UEFI default software. This is a good thing. However, there is a small problem. To install Windows 10 on UEFI, you must create a bootable drive using the FAT32 file system. The FAT32 file system can only store files smaller than 4 GB.

This may not be a problem for regular users. As of this writing, the default “install.wim” file in Windows 10 is less than 4 GB. However, if you create a custom image file with custom software and settings, this “install. Wim” can be large. In these situations, you can split the Install.wim file into several SWM files. This allows you to create a UEFI boot drive in FAT32 format without any problems.

Let’s look at two ways to share an install.wim file. The first method uses a third-party tool and the second method uses a built-in Windows command. Follow the method you selected.

Before proceeding, make sure that the custom install.wim file is available. Suppose you know how to create a boot drive.

Share a third-party tool to share the Install.wim file

To share the install.wim file, we use a free portable tool called GImageX. Download the tool from the official website and extract the content to your desktop.

Open the extracted folder, navigate to the “x64” or “x84” folder, depending on your system type, and double-click the EXE file. Since you are a portable tool, you do not need to install it.

With the tool open, go to the “Share” tab. Click the “Browse” button below the WIM Source section, navigate to the location of the source file “install.wim” and open it.

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Share the installation Wim file Select the source

Next we have to choose a destination. Click the “Browse” button below the SWM Destination section, navigate to the location where you want to save the SWM files, name the file “install.swm” and click Save. The path is automatically added to the tool.

In the Shared Size SWM Destination section, select. The tool allows you to select 4 GB or 600 MB. Choose one of the options. In this case, 600 MB is selected for presentation.

Finally, click the “Share” button. If you want to check the integrity of the shared files, select the “Confirm” check box in the “Settings” section.

Split Install Wim File Select an item

As soon as you click the button, the tool starts sharing the install.wim file. Depending on the size of the file, it may take some time.

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Shared installation The Wim file sharing process

When everything is done, the tool will display the message “Image shared successfully”.

Installing the Split Wim File Splitting Done

If you move to the destination folder, you will find the new numbered install.swm files.

Share Wim Gimagex Split files

Commands for sharing the Install.wim file

If you do not want to use a third-party tool, you can use the built-in DISM tool to share install.wim. It requires only one command line.

First, find the command line in the Start menu, right-click it, and select Run as administrator.

In the Command Prompt window, run the following command and replace the source and destination paths with the actual paths. In this case, the source is located in drive “J” and the SWM files are stored in drive “H”.

By default, the command splits install.wim into 1 GB files. You can resize the output file by resizing it /filesize parameters Mt.

If the command is successful, the message “Operation completed successfully” is displayed.

Split Install Wim File Split Command

Of course, you can also see the fragmented install.wim files in the destination folder.

Split Install Wim File Command Split Files

After you finish sharing the install.wim file, you can either copy the SWM files to the boot drive or use the WinPE Deployment Tool to create the boot drive. If you need help creating a boot drive with split install.wim files, I recommend checking out this Microsoft doc.

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