File extension is used by Borland C++. When the C preprocessor is used with the C, C++, or Objective-C compilers, it is integrated into the compiler and communicates a stream of binary tokens directly to the compiler's parser. However, it can also be used in the more conventional standalone mode, where it produces textual output. The output from the C preprocessor looks much like the input, except that all preprocessing directive lines have been replaced with blank lines and all comments with spaces. Long runs of blank lines are discarded.
File generated by the Microsoft Visual Studio compiler when compiling a Visual C++ project; contains the output from the preprocessor operation; may be used to diagnose and fix compilation errors. If you want to generate an ".i file" from a source file, you can right-click on the file and select "Properties." Then select C/C++ ? Preprocessor in the Properties tree. Finally, deselect "No" for the "Generate Preprocessed File" option. When you compile the file, an ".i file" will be created. However, this setting may also prevent the compilation process from completing. Therefore, "Generate Preprocessed File" should be reset to "No" when you want to compile your project.
File extension is used by Progress.