I used Excel. A bit of fiddling first of all. Remove the commas after the numbers. From the header information there are 2048 channels, each channel is 10eV. Create a column from 1 to 2048 and adjust to represent keV. Paste in the data and create a scatter graph with solid lines connecting points. The result is in the file. Does that look anything like your original data? I've also added the sheets.
the first peak is at 0.52 keV so oxygen, the second at 1.49 keV - aluminium
The EMSA file can be opened by excel. I found that dragging the file to an open spreadsheet to be the most effective path. Moreover, since the EMSA file places a common after every single data point, you just need to use Ctrl-F, find "," and replace it with "0".
import .emsa file to origin. if it showing in time format then this might work. double click the column and open column properties. go to options - custom display and write HH.00.i hope it works for you