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Format of FindFirst data block

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Offset Size Description

---PC-DOS 3.10, PC-DOS 4.01, MS-DOS 3.2/3.3/5.0---

00h

BYTE

drive letter (bits 0-6), remote if bit 7 set

01h

11 BYTEs

search template

0Ch

BYTE

search attributes

---DOS 2.x (and some DOS 3.x???)---

00h

BYTE

search attributes

01h

BYTE

drive letter

02h

11 BYTEs

search template

---WILDUNIX.COM---

00h

12 BYTEs

15-character wildcard search pattern and drive letter (packed)

0Ch

BYTE

search attributes

---DOS 2.x and most 3.x---

0Dh

WORD

entry count within directory

0Fh

DWORD

pointer to DTA???

13h

WORD

cluster number of start of parent directory

---PC-DOS 4.01, MS-DOS 3.2/3.3/5.0---

0Dh

WORD

entry count within directory

0Fh

WORD

cluster number of start of parent directory

11h

4 BYTEs

reserved

---OS/2 MVDM---

00h

WORD

"OS2_BMP_handle"

02h

WORD

"OS2_LastEnt"

04h

DWORD

"OS2_Checksum"

08h

BYTE

"OS2_usi_flag"

09h

DWORD

used by DOS emulator for second pass for volume-label searches

0Dh

WORD

(ret) "DOS_LastEnt" entry count within directory

0Fh

BYTE

OS/2 Processed-FindFirst flag
00h = FindFirst processed by DOS
42h = FindFirst processed by OS/2

10h

5 BYTEs

reserved for future use

---all versions, documented fields---

15h

BYTE

attribute of file found

16h

WORD

file time (see #01665 at AX=5700h)

18h

WORD

file date (see #01666 at AX=5700h)

1Ah

DWORD

file size

1Eh

13 BYTEs

ASCIZ filename+extension