Is there a way to use pragma to set a file as a precompile file?

[AlwaysLearning]

Using vs2008.
I am using it with precompilation turned on. The file that is supposed to be the precompile file keeps getting reset to /Yu rather than /Yc. Is there a way to use #pragma to set it /Yc within the file?

I looked at the msdn site already for the most likely directives that should do it and haven't had any luck.