How to search files in windows file explorer with specified extension name?

I assume you used the quotation marks here to show the text you typed, because ironically the exact way how it should work is to put the search in quotation marks...

so

*.m

finds .mp3 as well as .m but

"*.m"

should only find the .m files. Alternatively you could also write

ext:".m"

which would guarantee that only extensions are searched. (Although I am not sure if this is ever necessary here, because while windows can have a dot in the filename and also can have files without extensions I am not sure if it is possible to have both at the same time.)

using the following

"*.m"

will solve your problem.You can find more information on regex to be used in msdn in the following link .Advanced query syntax

Above that, you can also take advantage of the wildcard character *.

For example, if you want to search for a file with a name ending with 024 or starting with 024 then you can put in the search box like *024.* or 024*.* respectively.

Here the * after . represents files with any extensions, if you want particular then mention extension line 024.png.