i need to read the 2nd string from a TXT file and make it a variable for my basic compiler

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Question

@echo OFF
SET Spec=ST2.
FOR %%V IN ('TYPE %Spec%') DO SET X=%%V
ECHO %X%
PAUSE

a file ST2. has 2 lines, it goes like this
old ABC

i need a batch that returns a var ABC
2nd line is an empty line
are there batch commands to get the 2nd string ABC?

"old" is the basic compiler's command to load a file ABC
once i exit the basic compiler, i need to send the file "ABC" to a different directory to compile and make an ABC.EXE there
i hope to do it in one batch file

i can not just add a string "ABC" to a batch, it much be read, because i have 10s of "ST2." 's from many directories and they are constantly changing, it depends on what file i am working, ST2. is auto-produced by the macro.

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