How to use Tortoisesvn library?

I can't get diff from the subversion because it recognize the file that I'm commited is a binary file, so i need to use some functions in Tortoisesvn's library to compare. But I don't know how to use it :( . Please开发者_开发知识库 help! thanks :D

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What kind of file is it? Which external compare tool are you using?

If all else fails ... use the command line.