M.file in matlab

i have R2015a matlab version . i tried to open .m files. Whenever I double-clicked them, they opened in new matlab windows. is there any setting that i can do to open the m.files that i want in the same window matlab without open new window matlab . thank you

[Andy]

Are you double clicking in the "Current Folder" display within the Matlab window or are you double clicking on the file in a normal windows File Explorer window?

[mohammed hussein]

i have one folder that has multiple m. file . Whenever I double-clicked in any of them (m.file) . it opened in new matlab window . i double clicking on file in a normal window file explorer window