I have found problem :

I have DPs_Base.exe in folder name "DP Base" and destination (XP folder) location in : "DP Base\temp"

But If I suppress space in name folder the conversion is good !

I make many test, Just one reproduce the good ?

I'm not sure what you're saying here...
-Are you saying that the space in the path was causing the conversion to be incomplete/inexistent?
-Are you saying that in your test without spaces in the path only one out of the many tests was successful?
-Or are you saying both of the above?

I have DPs_Base.exe in folder name "DP Base" and destination (XP folder) location in : "DP Base\temp"

But If I suppress space in name folder the conversion is good !

I make many test, Just one reproduce the good ?

DPs_Base.ini :

[General]
wizardButtons	= "yes"
GUI		= "yes"

[Settings]
type		= "disc"
location	= "D:\DP base\temp"
DriverPacks	= "select"
DPsMethod	= "1"
finishMethod	= "GUIRunOnce"

[OptionalSettings]
KTD		= "none"
QSC		= "yes"

[SelectDriverPacks]
DP_Chipset	= "yes"
DP_CPU		= "no"
DP_Graphics_A	= "no"
DP_Graphics_B	= "no"
DP_Graphics_C	= "no"
DP_LAN		= "no"
DP_MassStorage	= "yes"
DP_Sound_A	= "yes"
DP_Sound_B	= "no"
DP_WLAN		= "no"
DPs_3rd_party	= "no"
DP_MassStorage_textmode = "yes"

My original file svcpack.inf have code : UNICODE. And after slipstream, the file is corrupt due to no conversion to ansi !