Pretty much most classes with "attachment" in the name. And you're almost certainly going to get it wrong AND break all your support and maintenance processes.
Short answer is "do not do this". Disable attachments, and write an add-on to provide a completely new attachments interface.
Is there any spring configuration file, So we can override the default class instead of editing the original class file,.
I don't know. I would not do it that way, I would not even think about overriding the class. Do it as an add-on.
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