The problem with this *deb is that, although it works perfectly as a Debian package, it doesn't fit the restrictions of your tablet's Application Manager. (Which is a good thing, because it actually breaks something that under normal circumstances users shouldn't touch.)

The responsible developer explained here and here how to work around those Maemo-specific restrictions to get the package running. As I understand, you'll also have to revert some of the required changes when the next SSU comes out, otherwise you won't be able to install that.

Given that all of this has the potential to break things on your tablet, that the next SSU will fix this error anyway and that you can still open the files by selecting them from the file manager, you might be better off just waiting...