PC DOS 4.01 was released in August 1988. This maintenance release is only about one month older than PC DOS 4.00. Contrast this with MS-DOS 4.01, which was released in April 1989.

Directory Listings of the two 720Kb distribution diskettes are provided below.

[PCjs Machine "ibm5170-pcdos401"]

Waiting for machine "ibm5170-pcdos401" to load....

Directory of PC DOS 4.01 (Disk 1)

 Volume in drive A has no label
 Directory of A:\

IBMBIO   COM*    32816   8-03-88  12:00p
IBMDOS   COM*    36000   8-03-88  12:00p
AUTOEXEC BAT        39   6-17-88  12:00p
ANSI     SYS      9148   6-17-88  12:00p
COMMAND  COM     37637   6-17-88  12:00p
CONFIG   SYS        96   6-17-88  12:00p
COUNTRY  SYS     12838   6-17-88  12:00p
DISKCOPY COM     10428   6-17-88  12:00p
DISPLAY  SYS     15741   6-17-88  12:00p
DRIVER   SYS      5274   6-17-88  12:00p
FASTOPEN EXE     16302   6-17-88  12:00p
FDISK    COM     70151   6-17-88  12:00p
FORMAT   COM     22923   6-17-88  12:00p
IFSFUNC  EXE     21653   8-03-88  12:00p
KEYB     COM     14759   6-17-88  12:00p
KEYBOARD SYS     23360   8-03-88  12:00p
MODE     COM     23056   8-03-88  12:00p
PRINTER  SYS     18946   6-17-88  12:00p
REPLACE  EXE     17199   6-17-88  12:00p
SELECT   DAT     22453   8-03-88  12:00p
SELECT   EXE     99545   8-03-88  12:00p
SELECT   HLP     27562   8-03-88  12:00p
SELECT   PRT      1594   8-03-88  12:00p
SHARE    EXE     10301   8-03-88  12:00p
SYS      COM     11472   6-17-88  12:00p
VDISK    SYS      6376   6-17-88  12:00p
XCOPY    EXE     17087   6-17-88  12:00p
XMA2EMS  SYS     29249   8-03-88  12:00p
XMAEM    SYS     19312   6-17-88  12:00p
EGA      CPI     49052   6-17-88  12:00p
LCD      CPI     10592   6-17-88  12:00p
4201     CPI      6404   6-17-88  12:00p
4208     CPI       641   6-17-88  12:00p
5202     CPI       402   6-17-88  12:00p
012345   678       109   6-17-88  12:00p
DOS00I   400*        0   6-17-88  12:00p
       36 file(s)     700517 bytes
                       17408 bytes free

Directory of PC DOS 4.01 (Disk 2)

 Volume in drive A has no label
 Directory of A:\

APPEND   EXE     11186   8-03-88  12:00p
ASSIGN   COM      5785   6-17-88  12:00p
ATTRIB   EXE     18247   6-17-88  12:00p
BACKUP   COM     33754   6-17-88  12:00p
BASIC    COM      1065   6-17-88  12:00p
BASICA   COM     36285   6-17-88  12:00p
CHKDSK   COM     17771   6-17-88  12:00p
COMP     COM      9491   6-17-88  12:00p
DEBUG    COM     21606   6-17-88  12:00p
DISKCOMP COM      9889   6-17-88  12:00p
DOSUTIL  MEU      6660   6-17-88  12:00p
EDLIN    COM     14249   6-17-88  12:00p
FILESYS  EXE     11125   6-17-88  12:00p
FIND     EXE      5983   6-17-88  12:00p
FORMAT   COM     22923   6-17-88  12:00p
GRAFTABL COM     10271   6-17-88  12:00p
GRAPHICS COM     16733   6-17-88  12:00p
GRAPHICS PRO      9413   6-17-88  12:00p
JOIN     EXE     17457   6-17-88  12:00p
LABEL    COM      4490   6-17-88  12:00p
MEM      EXE     20133   6-17-88  12:00p
MORE     COM      2166   6-17-88  12:00p
MORTGAGE BAS      6207   6-17-88  12:00p
NLSFUNC  EXE      6910   6-17-88  12:00p
PCIBMDRV MOS       295   6-17-88  12:00p
PCMSDRV  MOS       961   6-17-88  12:00p
PCMSPDRV MOS       801   6-17-88  12:00p
PRINT    COM     14024   8-03-88  12:00p
RECOVER  COM     10732   6-17-88  12:00p
REPLACE  EXE     17199   6-17-88  12:00p
RESTORE  COM     40030   6-17-88  12:00p
SHELL    CLR      4438   6-17-88  12:00p
SHELL    HLP     65667   8-03-88  12:00p
SHELL    MEU      4588   8-03-88  12:00p
SHELLB   COM      3937   8-03-88  12:00p
SHELLC   EXE    154377   8-03-88  12:00p
SORT     EXE      5914   6-17-88  12:00p
SUBST    EXE     18143   6-17-88  12:00p
TREE     COM      6334   6-17-88  12:00p
DOS01L   400*        0   6-17-88  12:00p
       40 file(s)     667239 bytes
                       51200 bytes free