DBGHELP.DLL中有一些文档化的WinDBG扩展命令，例如!sym and !dh，分别设置符号加载诊断和转储模块PE头。看到itoldyouso是小写的，我不禁怀疑它是否是一个未经文档化的WinDBG扩展命令。启动WinDBG并输入!itoldyouso，产生了以下结果：

0:000> !itoldyouso!IToldYouSo <module>[symbol]!IToldYouSo tests the validity of a module against a symbol file.

The module can be specified by either its name or base address.

If a symbolfile is not specified, thenthe loaded symbol is tested.

Otherwise,if a pdb or dbg symbol filepath is specified, it is tested

against the loaded module.

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