Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 29h
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     This function regards the following as separator characters:
     : . ; , = + tab space
 
     This function regards all control characters and the following as
     terminator characters:
     : . ; , = + tab space < > / " [ ]
 
     If no valid filename is present in the string to be parsed, upon
     return ES:DI+1 points to an ASCII blank.
 
     If the * wildcard character occurs in a filename or extension, it
     and all remaining characters in the corresponding field in the FCB
     are set to ?.
 
     This function (and file control blocks in general) cannot be used
     with file specifications that include a path.
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