autorun from usb pendrive

hi guys,
plz tell me how do i run an executable file from my usb pen drive.

now, i know how to do it if the exe is present in the main/root directory of drive.

but the problem is, i have a folder in the drive in which the executable is present. like f:\abc\pqr.exe
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guys plz answer it.

how do i autorun an executable from a pen drive, if the executable is located in some folder of the drive???