what are the executable types on windows/cmd? and what are their priorities?

Question

For example if there are multiple executable files on the path i.e., a.exe, a.bat and user types \'a\' (enter), which file will execute?

What other executable format

Answer 1

Windows looks at the PATHEXT environment variable to decide which file types are considered executable:

> echo %PATHEXT%
.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC

The first matching file on the path that has one of those extensions will be executed.

You can use the assoc and ftype commands to find out how the file will be executed:

> assoc .msc
.msc=MSCFile

> ftype MSCFile
MSCFile=%SystemRoot%\system32\mmc.exe "%1" %*

(You can use PATHEXT, assoc and ftype to make any file type executable.)