No, it will not open the same as on Powerpoint, and I doubt that's possible to work around. All of these presentation programs are great when used consistently, but they run into issues when trying to interpret closed formats that aren't made by the company that develops them.

If you can't make one of those programs your standard everywhere (you do realize there's Libreoffice and Kingsoft for Windows, right?) I'd recommend exporting it into a PDF and presenting it from that. You won't be able to edit it, but that's what I'd do if all you're trying is to show it.

If the only problem is the background opacity (I doubt it, there's probably all manner of weird glitches), you can change the opacity of the background in Libreoffice - go into 'Master View' to edit the slide templates, and you can mess with the uneditable background content as if it were just text and images.