I have signed and packaged the Xamarin application and so have created the apk file using Visual Studio.
How can I zipalign this file in Windows?
On my end, the path it's quite different, i installed android studio, which created the following path:
C:\Users\\AppData\Local\Android\Sdk\build-tools\\zipalign.exe
Just direct to that path and run the command, make sure to use full path of where your file is located...
Hope that helps.