fix doc-files

Author: TomTasche

app/src/main/java/at/tomtasche/reader/background/CoreLoader.java

@@ -60,6 +60,7 @@ public boolean isSupported(Options options) {
         return options.fileType.startsWith("application/vnd.oasis.opendocument") ||
                 options.fileType.startsWith("application/x-vnd.oasis.opendocument") ||
                 options.fileType.startsWith("application/vnd.oasis.opendocument.text-master") ||
+                options.fileType.startsWith("application/msword") ||
                 (this.doOoxml && (
                         options.fileType.startsWith("application/vnd.openxmlformats-officedocument.wordprocessingml.document")
                         // TODO: enable xlsx and pptx too