win7的任务计划中经常见到这个pcalua.exe -a，该执行程序位于C:\windows\system32，属于windows的系统文件，是Windows程序兼容性助理(Program Compatibility Assistant)的一个组件，会关联一些软件，来检测软件和windows的兼容性。
The Program Compatibility Assistant detects known compatibility issues in older programs. After you have run an older program in this version of Windows, it notifies you if there is a problem and offers to fix it the next time you run the program. If the compatibility issue is serious, the Program Compatibility Assistant might warn you or block the program from running. If that happens, you'll have the option to check online for possible solutions.
就这样，没什么好说的，很旧的知识。
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