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my question is can i add patches or modify the game files like if i add installed on ym computer with the disk
I can't quite make out what you're trying to say, but no one's stopping you from tinkering with the files to your heart's content.
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cowman1005: my question is can i add patches or modify the game files like if i add installed on ym computer with the disk
You mean can you use mods on the GOG version? Yes, you can. You don't need to patch though, as the GOG version is patched to the latest.
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cowman1005: my question is can i add patches or modify the game files like if i add installed on ym computer with the disk
If you look in the Fallout forums here on Gog you'll even find a list of recommended mods!