Modding Help (Windows 8.1) Unable to unpack packed.pak - This app can't run on your PC

Hello, I am running Starbound on Windows 8.1 64 bits. I've seen countless tutorials on how to unpack the packed.pak file. However, if I try to do it through cmd, when I run the asset_unpacker.exe it says "Access Denied" and a Windows message pops up saying "This app can't run on your PC" and something or other. If I try to use other programs (modding tools), they either crash or don't work.

I've found some people in this forum with a similar issue, but their fixes didn't work for me (such as removing spaces in the directory names) or they didn't get help at all. Did I not search enough?

I'm inexperienced with modding, and maybe I don't need to unpack the packed.pak file... Just so you know, all I want to do is change the damage voice sound effect for the female human.

What do I do?

 

Same issue. Ran cmd.exe as administrator while logged in the Administrator account. Please don't tell me I need to have further administrative rights than THAT.
Any other suggestions?

 

Did not work. It's the same thing as using cmd.exe. I edited correctly to my directories:

@Echo OFF
ECHO Please wait while your files finish unpacking. You will be notified when to close the window
"C:\Program Files (x86)\Steam\steamapps\common\Starbound\win32\asset_unpacker.exe" "C:\Program Files (x86)\Steam\steamapps\common\Starbound\assets\packed.pak" "C:\Program Files (x86)\Steam\steamapps\common\Starbound\unpacked"
PAUSE

One thing that I noticed... Is the asset_unpacker.exe file size supposed to be 0KB?

 

Yes, that was the issue! It's not the first time Steam does this when updating games, I should have noticed this way before. Thank you for your time.
This thread really asks for my profile picture