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I can't seem to figure it out. I thought Google Docs supported all the doc file extensions... Was I wrong?
In any case, how can I convert it to an extension Google Docs support? Without downloading Microsoft Office 2011.
I've found guides online, but they're all for .XLSX and others, also some for .XLXS but none of them work.
I figured out the problem. Thanks @Dorje for your help, gave me a hint. :)
The problem was with the file's file extension, it ended with .xlxs, that was the name Microsoft Office 2011 gave it, so I thought it was correct.
I renamed the file with a .xlsx extension, and when I uploaded it again it was correctly encoded in the new language.
For anybody with this problem in the future, the problem is the file extension. :)
.xlxs is a rather rare file extension (since I can't really find it anywhere), but changing it to .xlsx should not be too much of a problem.
So, it looks like you want to upload an Excel document that has an .XLXS file extension. If that's it, go to drive.google.com, choose the upload icon 
, find the file you want to upload, and choose upload.
If in addition to this you want to edit the file, you need to click on the check box next to the file you want to edit in Google Drive, choose "More" in the menu, choose open with 
, and choose Google Sheets. This will make it editable in Google Sheets.
Weird huh? I hope this helps.
