I recently required the use of ESXi Customizer to integrate some NIC drivers into my ESXi 5.5 ISO.

Having never used it before, I was surprised to see that it was not compatible with Windows 10 but as the script is now unsupported, I understand why. I’m no programmer but it states that it is supported on Windows 8 and 8.1 so 10 should be similar enough to work so I got cracking to disable the compatibility checks and see if I could make use of it.

Once you’ve downloaded and extracted ESXi Customizer, you’ll have a bunch of files in a folder. The file we are looking for is called ESXI-Customizer.cmd and you need to open that in a text editor such as Notepad, you should be able to right-click it and choose ‘Edit’ to do this.

Then you need to find and remove the following lines:

if /I "%1"=="silent" goto :eof

if "!WinVer!"=="5.0" call :logCons --- INFO: Running on Windows 2000. What?!

if "!WinVer!"=="5.1" call :logCons --- INFO: Running on Windows XP.

if "!WinVer!"=="5.2" call :logCons --- INFO: Running on Windows Server 2003.

if "!WinVer!"=="6.0" call :logCons --- INFO: Running on Windows Vista or Server 2008.

if "!WinVer!"=="6.1" call :logCons --- INFO: Running on Windows 7 or Server 2008 R2.

if "!WinVer!"=="6.2" call :logCons --- INFO: Running on Windows 8 or Server 2012.

if "!WinVer!"=="6.3" call :logCons --- INFO: Running on Windows 8.1 or Server 2012 R2.

if "!WinVer!" GTR "6.3" call :logCons --- WARNING: Running on a Windows newer than 8.1 / 2012 R2. Don't know if this will work ...

if "!WinVer!" LSS "5.1" call :earlyFatal Unsupported Windows Version: !WinVer!. At least Windows XP is required & exit /b 1

if "!WinVer!" NEQ "6.1" call :logCons --- WARNING: Your Windows version is supported for customizing ESXi 5.x, but not ESXi 4.1.

And save the file. Now, you can run it and use the program as needed and it will open and run on Windows 10. I wouldn’t recommend using this for anything mission-critical as I can’t guarantee there aren’t any bugs with running it on an unsupported system but for me it worked fine and the resulting ISO worked perfectly.