Using powershell you can find a file you can run a bat file that exports to a file can be found via lisp.
So the how to, this exports the file path to the file d:\acadtemp\ans.txt so can read that via a lisp. You need to save the bat and ps1 file and set the path correct in code.
(defun run_and_wait (strCommand / WScript_obj)
(vl-load-com)
(if (setq WScript_obj (vlax-get-or-create-object "WScript.Shell"))
(vl-catch-all-apply 'vlax-invoke-method (list WScript_obj "Run" strCommand 4 :vlax-true))
);if
);defun
(run_and_wait "d:\\acadtemp\\testgetfile.bat")
testgetfile.bat
powershell.exe -ExecutionPolicy Bypass -Command D:\acadtemp\testgetfile.ps1
ps1 file
$filename = 'Bricscad.exe'
$searchinfolder = 'c:\program files\Bricsys*'
Get-ChildItem -Path $searchinfolder -Filter $filename -Recurse | %{$_.FullName} >d:\acadtemp\ans.txt
