MSX is a disk image created by a Korean program called "updownc".   
[This info found at http://www.faq.msxnet.org/suffix.html]

This program by Sean Young converts a MSX disk image to a DSK one.

source code taken from:
http://www.funet.fi/pub/msx/othersys/msx2dsk.c

Morphos conversion by Fabrizio "Lanch" Bartoloni (lanch@tiscali.it)

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 3869    9720  39.8% -lh5- e3e9 Jun  7 22:16 msx2dsk/msx2dsk
[generic]                  905    2377  38.1% -lh5- a6ba Jun  7 20:06 msx2dsk/msx2dsk.c
[generic]                  316     553  57.1% -lh5- 190f Jun  7 23:14 msx2dsk/msx2dsk.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         3 files    5090   12650  40.2%            Jun  9 19:03