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FILE TYPES.
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Files are described by up to 8 characters plus an extension name of up to
3 characters. Whereas the file name is selected by the user, the extension
name is frequently defined by the system in use. Some typical extension
names relevant to MS-DOS and Turbo C are:
.BAK Backup source file - a resaved file automatically saves the
original as a .BAK file.
.BAT Batch file containing a sequence of MS-DOS command lines.
The AUTOEXEC.BAT file is automatically executed when the computer
is switched on, so that any required conditions are initialized.
.BGI Borland Graphics Interface files, which are the graphics device
drivers for the screen display.
.C A C source code file (not compiled).
.COM Compiled file, which is an executable file from MS-DOS.
.EXE Executable file from MS-DOS.
.H A header file, used in C to list the headers to previously prepared
functions, which are stored in library (.LIB) files.
.HLP Help file.
.LIB Library files for mathematical, graphical functions, etc.
.MAP Contains information about the executable file, such as the list of the
segemnts in the program, the program start address and any warning or
error messages produced during the link.
.OBJ Object file for the binary machine instructions produced by the
compiler, before 'linking' with the library files to produce the
final executable (.EXE) file.
.PCK A list of the files previously being edited in the integrated
development environment, for recall by File/Pick option.
.PRJ A project file, containing the names of all files to be compiled and
linked, when there are multiple source files (as allowed in C).
.SYS System file used by MS-DOS.
.TXT Text file in ASCII format.
Further details can be found in the MS-DOS manual.