Did you tried this:

if not exist "%CDROM%\1.EXE" goto next
if exist "%CDROM%\1.EXE" (start "" /wait "%CDROM%\1.EXE")
:next
"D:\2.EXE"

Fine, he's all yours...

Edited May 26, 201016 yr by MrJinje

could be that "if" parameter is bad written?

IF EXIST "%CDROM%\1.EXE" (START "" /WAIT "%CDROM%\1.EXE")
"D:\2.EXE"

Your if is bad written because you don't have good parenthesis. You need make every command go inside one set of parenthesis, but that doesn't matter, because you ignore my posts, so I am wasting my time telling you. Good luck figuring it out.

IF EXIST "D:\1.EXE" (START "" /WAIT "D:\1.EXE"
"C:\2.EXE")

Well I disagree here, the code you've quoted was mine and was given because it was believed to be correct for the task which was intended.

if exist "%CDROM%\1.exe" (Start /wait "%CDROM%\1.exe") run "C:\2.exe" ELSE (run "C:\2.exe")
exit

It appears from that example that C:\2.exe is intended to be run regardless of whether or not %CDROM%\1.exe exists, (it is found on both sides of the ELSE statement). For that reason the parentheses are closed correctly.

At the final script is resolved as follows:

@ Echo off
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: Z:) do if exist %%i\1.exe start /wait %%i\1.exe
"%~dp02.exe"

The error was SET CDROM=%%i:

Edited May 31, 201016 yr by maestrodellaves

At the final script is resolved as follows: <snip />

Well without seeing the script I would be hesitant in believing that anything has been solved.

If I was however going to use the 'check every letter of the alphabet' method then I'd probably use a system to break the loop when found. (the trouble with the method you've suggested is that if the file is found at D:, the script would still check for it a E: F: G:.. etc.)

@ECHO OFF
SETLOCAL
(SET HOST_DRV=)
FOR %%# IN (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) DO (
	CALL :SUB %%#:||GOTO :NEXT)
:NEXT
REM The commands you provided in your last message.

IF DEFINED HOST_DRV START "" /WAIT "%HOST_DRV%\1.EXE"
IF EXIST "C:\2.EXE" START "" /WAIT "C:\2.EXE"

REM The rest of your commands go here.




GOTO :EOF
:SUB 
IF EXIST %1\1.EXE (SET "HOST_DRV=%1"&&EXIT/B 1)
EXIT/B 0