Generally: the operating system of the Enterprise (EXOS) does not need fileextensions, because it handles the files by the
fileheader.But because the disk system uses an MS-DOS compatible disk format, you can use extensions, only for your own fun
But most of Enterprise users use some typical extensions:
.COM runnable machine code program
.TRN trainer version (eternal life or other extras in the game)
.BAS IS-BASIC programfile
.WP document file for the internal Word Processor
.TXT normal ASCII format text file
.ZIP compiled BASIC program
.EXT, .REL, .XE, .XR system (EXOS) extensions
.SCR not loadable directly, typically the loading screen of the game, follows the .COM file
.PRG not loadable directly, typically the main program of the game, follows the .SCR file
.ASM assembly source code for the ASMON/ASMEN assembler program
.F, .FEN assemby source code for the FENAS assembler program
.HEA assembly source code for the HEASS assembler program
.DTF compressed program, needed a loader utility to load it
.DTM digital music (mostly converted .MOD files), needed a player program to play it
.ROM rom image file, primary a ROM version of the system extensions. Exist a utility which can load these to the RAM.
Secondary some converted Spectrum games contain a modified ZX Spectrum ROM, these files are also named as .ROM