DosQueryAppType is the name of the API telling which type a program has. This 32-bit call thunks to the 16-bit DosQAppType which does. DosQAppType checks if the specified programname has a path. If is has a (absolute) path nothing extra is done to find the file. But, if it hasn't the PATH is searched. If not found the .EXE extention is eventually (if not present) added to the filename and the PATH is researched. Then the Kernel is called, DOSIQAPPTYPE. DOSIQAPPTYPE does a farcall to w_QAppType which in turn thunks to the 32-bit loader function LDRQAppType. (Note that the LDR-prefix is in capital letters. This could be understood as this is an officially exported function from the Loader subsystem.

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