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.PCH File Extension


File Type Precompiled Header File
File Format File
Common? No
File Description Contains programming code referenced by a source code file, often using an #include preprocessor directive; may reference other header (.H) files and other resources.

PCH files are used by Microsoft Visual C++ and other software development programs, such as Apple Xcode; PCH files used by Xcode are called Prefix Header files and are typically named "[name]_Prefix.pch."
Program(s) that open pch files Mac: Apple Xcode; Any text editor
Windows: Microsoft Visual C++; Any text editor

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/pch