If you're determined to tinker with the source then I suggest looking at the details of function 0x38 in dos.cpp and the associated country info table in dos_tables.cpp, but I think you will find it less trouble overall to boot real DOS and use its country system.

I would like to change the source. Booting real DOS will put in trouble the "operators" that will need to move application files from the image.
Looking to function highlighted by ripsaw8080 and related country info table, my only trouble is to know numerical value of specific fields in country info structure :

/* Date format */ 0x00, 0x00,
/* Currencystring */ 0x24, 0x00, 0x00, 0x00, 0x00,
/* Thousands sep */ 0x2c, 0x00,
/* Decimal sep */ 0x2e, 0x00,
/* Date sep */ 0x2d, 0x00,
/* time sep */ 0x3a, 0x00,
/* currency form */ 0x00,
/* digits after dec */ 0x02,
/* Time format */ 0x00,
/* Casemap */ 0x00, 0x00, 0x00, 0x00,
/* Data sep */ 0x2c, 0x00,
/* Reservered 5 */ 0x00, 0x00, 0x00, 0x00, 0x00,
/* Reservered 5 */ 0x00, 0x00, 0x00, 0x00, 0x00

Can someone help me ?

J

check this and the tables linked
http://www.delorie.com/djgpp/doc/rbinter/id/84/27.html

although if your applications reads the output from DIR you might need to change src/shell/shell_cmds.cpp

Wonderful !!
Changing :

/* Date format */ 0x00, 0x00 -> /* Date format */ 0x01, 0x00, (European format)

and

/* Time format */ 0x00, -> /* Time format */ 0x01

all works well.

Thanks a lot. Now i am really so happy.

J