I believe that there's a bug when you are not using English version of Microsoft Office, since when you import the PowerPoint file, it will automatically create a slide.bmp file if you're using English version of Microsoft Office, however, when you use other language's version of Office, for instance, Chinese, it will create a bmp file with the filename of 投影片.BMP which OpenLP could not understand, would it be possible to allow OpenLP to create the image file with only numbers, e.g. .bmp, but not slide.bmp?