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==Overview==
===DOS Stub===
The DOS stub is a valid [[MZ]] exe. This enables the
===NE Header===
The NE header is a relatively large structure with multiple characteristics. Because of the age of the format some items are unclear in meaning. The structure is as below (some comments may be wrong. If so please change):
<
struct NE_header {
char sig[2]; //"NE"
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uint16_t EntryTableOffset; //Offset of entry table, see below
uint16_t EntryTableLength; //Length of entry table in bytes
uint32_t FileLoadCRC; //
uint8_t ProgFlags; //Program flags, bitmapped
uint8_t ApplFlags; //Application flags, bitmapped
uint16_t InitHeapSize; //The
uint16_t InitStackSize; //The
uint32_t EntryPoint; //CS:IP entry point, CS is index into segment table
uint32_t InitStack; //SS:SP
uint16_t SegCount; //Number of segments in segment table
uint16_t ModRefs; //Number of module references (DLLs)
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uint32_t OffStartNonResTab; //Offset from start of file to non-resident names table
uint16_t MovEntryCount; //Count of moveable entry point listed in entry table
uint16_t FileAlnSzShftCnt; //File
uint16_t nResTabEntries; //Number of resource table entries
uint8_t targOS; //Target OS
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uint16_t mincodeswap; //Minimum code swap area size
uint8_t expctwinver[2]; //Expected windows version (minor first)
};
//Program flags
//DGroup type (what is this?)
enum dgrouptype {
none, //None
sinshared, //single shared▼
multiple, //Multiple▼
null //(null)
};
#define GLOBINIT 1<<2 //global initialization
#define PMODEONLY 1<<3 //Protected mode only▼
#define INSTRUC86 1<<4 //8086 instructions
#define INSTRU286 1<<5 //80286 instructions
#define INSTRU386 1<<6 //80386 instructions▼
#define INSTRUx87 1<<7 //80x87 (FPU) instructions▼
//Application flags
//Application type
enum apptype {
none,
fullscreeen, //fullscreen (not aware of Windows/P.M. API)
▲ sinshared,
winpmcompat, //compatible with Windows/P.M. API
▲ multiple,
winpmuses //uses Windows/P.M. API
};
#define
//bit 4 reserved?
▲#define PMODEONLY 1<<3
#define
#define
#define DLL 1<<7 //DLL or driver (SS:SP invalid, CS:IP->Far INIT routine AX=HMODULE,returns AX==0 success, AX!=0 fail)
▲#define INSTRU386 1<<6
▲#define INSTRUx87 1<<7
//Target Operating System
enum targetos {
unknown, //Obvious ;)
os2, //OS/2 (as if you hadn't worked that out!)
win, //Windows (Win16)
dos4, //European DOS 4.x
win386, //Windows for the 80386 (Win32s). 32 bit code.
BOSS //The boss, a.k.a Borland Operating System Services
};
//Other OS/2 flags
#define LFN 1 //OS/2 Long File Names (finally, no more 8.3 conversion :) )
#define PMODE 1<<1 //OS/2 2.x Protected Mode executable
#define PFONT 1<<2 //OS/2 2.x Proportional Fonts
#define GANGL 1<<3 //OS/2 Gangload area
</syntaxhighlight>
==See Also==
===NE===
*[http://bytepointer.com/resources/win16_ne_exe_format_win3.0.htm]
*[http://www.nondot.org/sabre/os/files/Executables/EXE-3.1.txt OSRC]
*[http://www.fileformat.info/format/exe/corion-ne.htm fileformat.info]
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