After looking multiple sites I've found a simple way using only one command line.
I've never used command line before, but after some experimentation i've came with the following solution:
for /f "tokens=1* delims=." %i in ('dir /b *.svg') do "C:\Program Files\Inkscape\inkscape.exe" --without-gui --file="%i.svg" --export-emf="%i.emf"
Breaking it down:
for is a command to perform an action to multiple files. It's structure is something like: for "files in a certain condition" do "especific command"
/f "tokens=1* delims=." %i in ('dir /b *.svg')
This is the "condition". In my case, I'm looking for all SVG files, but of course it works with others formats. All this "fancy" code does is store the file name, before the extention, in the variable "%i". This will be usefull in the comand.
That is what you will perform in all the files.
"C:\Program Files\Inkscape\inkscape.exe" --without-gui --file="%i.svg" --export-emf="%i.emf"
This is the same command Marnen Laibow-Koser used above. I'm a newbie, i don't know how you use just "inkscape", so i've putted all the way to the .exe.
The last part is where we use the variable to instruct the program to wich file it should pick and how export.
Again, I'm exporting SVG to EMF, but just change it to what you want. Here is why the variable are so important. So you can keep the same name, just changing the extention.
Don't forget to use the quotes, since your files can have some space in it's name.
Of course you also need to be in the folder where your files are. If your are also a newbie do this:
It will put you in the correct drive.
It will take you to the specific folder. You can use the windows explorer and click with right button and copy the path as text.
That's it. I'm newbie, soo it might be someway more efective to do it, but this will work.
Last tip: If you are working with a lot of files, you can use CTRL + C to stop the command line if it's not working how it should, and try again.