Hi I am new into modding Red Alert 3 so I absolutely know nothing about modding the game! but I wanted to change the voices of my units! so where do I start like maybe I have to open a file? and what software do I neeed?

You'll have to include the audio assest.
See SDK\audio\AudioAssets.xml
in Voice.xml you can specify the different audio samples.

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Zero Md thanks for replying to me, but please do not lose my forum yet this is not over remember I have zero knowledge in modding right now, so can we go slowly I have downloaded the sdk mod thing now.

BUT, what is step one how do I open the file or something... Like what is step one? like which folder should I be looking right now?
could you please provide a list to do.

Thanks sincerly

Okay I found it but nothing was in there.... But may I ask is there a way to open SKU files? like extract them

you don't need to open those files

For more information about RA3 modding see:
http://www.moddb.com/games/cc-red-alert-3/tutorials 
The RA3 Starters Guide Pt2 contains information about sound editing.

You can also look at the example mod files in:
http://www.moddb.com/mods/red-alert-3-upheaval/downloads/red-alert-3-upheaval-116-source-code 
Do notice that this mod probably won't compile with a vanilla SDK, because bibber used his own edited mod sdk.

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Thanks, but is there a possibility where I can mod another mod I like to tweak it to my own desire of the game

That's noramally not possible, because you need the uncompiled files

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