Get file version from Windows command line for use in a variable?

From my understanding you need filever.exe to do this. As pointed out in the comments. Also, I ripped the below word for word from here

How to use the Filever.exe tool to obtain specific information about a file in Windows

From what I gather about filever's output it's always in columns and you want the fifth column (version). So a simple for should suffice:

for /f "tokens=5 delims= " %%v in ('filever myFile.dll /b') do echo %%v

You can check using sigcheck.exe which is part of Sysinternals Suite, e.g.

$ sigcheck.exe -q -n app.exe
5.0.0.1241

By specifying -q (quiet, no banner) and -n will show you only the file version number, so you can assign it into the variable.

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If you're using Sigcheck64, the 64bit version provided for Nano Server, which doesn't support 32bit programs, the -q parameter has been replaced by -nobanner. E.g.

$ sigcheck.exe -nobanner -n app.exe
    5.0.0.1241

Source: What is the difference between Sigcheck and Sigcheck64? and SigCheck manual page.