Precompiled header that contains information referenced by a Power C program; similar to a .HH file, but used specifically by Power C development software.
Power C is an older ANSI-compatible C compiler for DOS that requires very little resources.
Program(s) that open hhh files
Windows: Power C compiler
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/hhh
