例如全盘搜索：rasadhlp.dll
发现以后给出 详细的 所有盘符 这个文件所在位置！

Set filename=rasadhlp.dll
Set alldrive=c d e f g h i j k l m n o p q r s t u v w x y z
For %%i in (%alldrive%) do if exist %%i:\ dir /s /b %%i:| find "%filename%">>results.txt
Type results.txt
Del results.txt
Pause
Exit

方法二
Set file=rasadhlp.dll
For /f "delims=. tokens=1,2" %%c in ("%file%") do wmic datafile where "extension='%%d' and filename='%%c'" get name
Pause

拿3楼的简化一下：
wmic datafile where "extension='dll' and filename='rasadhlp'" get name

Set 名=
Set 盘=A B...
For %%a In (%盘%) Do (
Dir %%a:\*%名%* /B /S >>存储位置.txt
)