Apologies if I got it wrong, and no offense taken - I learned a long time ago that it's OK to be wrong and admit it, and learn from it.

The WPI code will only do ONE iteration it returns the driveletter that the .cmd file is run from.
I dont see how you could do less than one loop?

So why bother with extra code that is unneccessary?
You didn't test this for yourself?

Both methods are fast, simple and effecient already. I, for one, failed to see your point. 3ns, spare me!

and add the label line after that
:DONECD

It breaks out of the FOR loop as soon as it finds the right drive instead of continuing to check all drives.

And yeah - the WPI stuff I have is prolly from an old release.

@ECHO OFF

for /f "delims=: tokens=1" %%i in ("%~dp0") do set drive=%%i:
set wpipath=%drive%\wpi

I noticed that you still haven't fixed presetup.cmd......... I bet you tried this but gave up because %CDROM% had a space at the end.   Make sure there's no space between ":" and "&" and it will work, and save you 3 nanoseconds (the WPI guys need to do this because it will save me having to click OK a few dozen times)

FOR %%i IN (C D E F G H I J K L M N O P Q R S T U V W X Y) DO IF EXIST "%%i:%TAGFILE%" (SET CDDRIVE=%%i:& goto DONECD)
:DONECD

Footnote:   it's gonna save about 3 nanoseconds so is it worth it?

Footnote2:  Someone please tell the guys who publish WPI that this is the way it's done, not 24 lines e.g.:

If exist c:\blah set CRDOM=C:\
if exist d:\blah set CDROM=D:\
...etc...

Footnote3:   WPI gives me 4 popups that I have to click OK button for..... 'cos I have a front-panel device with 4 USB camera card readers.

Bashrat - The perfectionist in me is offended a bit because you aren't using this code (maybe you didn't know), but it ain't important during preinstall..... on the other hand, WPI is Post-install and so they should learn and improve [NOW], because it does cause popups.

[BTW - thanks for the latest driver packs - I spent 2 days making sure my various builds work with it and found ZERO errors.   Kudos to you, and don't be offended by my attitude - I just want the code to be abso-fkn-lutely perfect, and NOW is not too soon )!]

I'm not sure I can follow what you're saying... Please post "before" and "after" lines

FOR %%i IN (C D E F G H I J K L M N O P Q R S T U V W X Y) DO IF EXIST "%%i:%TAGFILE%" (SET CDDRIVE=%%i:& goto DONECD)
:DONECD

Footnote:   it's gonna save about 3 nanoseconds so is it worth it?

Footnote2:  Someone please tell the guys who publish WPI that this is the way it's done, not 24 lines e.g.:

If exist c:\blah set CRDOM=C:\
if exist d:\blah set CDROM=D:\
...etc...

Footnote3:   WPI gives me 4 popups that I have to click OK button for..... 'cos I have a front-panel device with 4 USB camera card readers.

Bashrat - The perfectionist in me is offended a bit because you aren't using this code (maybe you didn't know), but it ain't important during preinstall..... on the other hand, WPI is Post-install and so they should learn and improve [NOW], because it does cause popups.

[BTW - thanks for the latest driver packs - I spent 2 days making sure my various builds work with it and found ZERO errors.   Kudos to you, and don't be offended by my attitude - I just want the code to be abso-fkn-lutely perfect, and NOW is not too soon )!]

Downloaded all the 7.04 files

Used:
Ryan VM 2.18 with Add-Ins
Ran the above with Nlite
Selected all driverpacks
Enabled KTD
Created ISO with Nlite
Nero 7 to create a DVD

Ran perfectly

Progress bar was perfect and accurate

You guys did it again !!!

I'm so glad that this long testing time wasn't in vain Thanks for the feedback!

Used:
Ryan VM 2.18 with Add-Ins
Ran the above with Nlite
Selected all driverpacks
Enabled KTD
Created ISO with Nlite
Nero 7 to create a DVD

Ran perfectly

Progress bar was perfect and accurate

You guys did it again !!!