What I did to fix this issue was make a custom contribution to override default office and image plugin filters. I changed the "order" attribute of OfficeFileImporter to 7 and the Imageplugin to 8. The contribution I'm using follows... (the classes associated with each plugin extend the default classes and override functions)
<?xml version="1.0"?>
<component name="com.concena.custom.dam.core.filemanager.plugins">
<require>org.nuxeo.ecm.platform.filemanager.service.FileManagerService.Plugins</require>
<require>org.nuxeo.dam.filemanager</require>
<require>org.nuxeo.ecm.platform.picture.filemanager.contrib</require>
<extension target="org.nuxeo.ecm.platform.filemanager.service.FileManagerService" point="plugins">
<plugin name="OfficeFileImporter" class="com.concena.custom.dam.importer.DefaultFileImporterCustom" order="7">
<filter>application/msword</filter>
<filter>application/vnd.openxmlformats-officedocument.wordprocessingml.document</filter>
<filter>application/vnd.openxmlformats-officedocument.wordprocessingml.template</filter>
<filter>application/vnd.ms-word.document.macroEnabled.12</filter>
<filter>application/vnd.ms-excel</filter>
<filter>application/vnd.openxmlformats-officedocument.spreadsheetml.sheet</filter>
<filter>application/vnd.openxmlformats-officedocument.spreadsheetml.template</filter>
<filter>application/vnd.ms-excel.sheet.macroEnabled.12</filter>
<filter>application/vnd.ms-excel.template.macroEnabled.12</filter>
<filter>application/vnd.ms-excel.addin.macroEnabled.12</filter>
<filter>application/vnd.ms-excel.sheet.binary.macroEnabled.12</filter>
<filter>application/vnd.ms-powerpoint</filter>
<filter>application/vnd.openxmlformats-officedocument.presentationml.presentation</filter>
<filter>application/vnd.openxmlformats-officedocument.presentationml.template</filter>
<filter>application/vnd.openxmlformats-officedocument.presentationml.slideshow</filter>
<filter>application/vnd.ms-powerpoint.addin.macroEnabled.12</filter>
<filter>application/vnd.ms-powerpoint.presentation.macroEnabled.12</filter>
<filter>application/vnd.ms-powerpoint.template.macroEnabled.12</filter>
<filter>application/vnd.ms-powerpoint.slideshow.macroEnabled.12</filter>
<filter>application/vnd.sun.xml.impress</filter>
<filter>application/vnd.sun.xml.impress.template</filter>
<filter>application/vnd.oasis.opendocument.presentation</filter>
<filter>application/vnd.oasis.opendocument.presentation-template</filter>
<filter>application/vnd.sun.xml.calc</filter>
<filter>application/vnd.sun.xml.calc.template</filter>
<filter>application/vnd.oasis.opendocument.spreadsheet</filter>
<filter>application/vnd.oasis.opendocument.spreadsheet-template</filter>
<filter>application/vnd.sun.xml.writer</filter>
<filter>application/vnd.sun.xml.writer.template</filter>
<filter>application/vnd.oasis.opendocument.text</filter>
<filter>application/vnd.oasis.opendocument.text-template</filter>
<filter>application/pdf</filter>
<filter>application/xml</filter>
<filter>text/xml</filter>
<filter>text/plain</filter>
<filter>text/html</filter>
<filter>application/xhtml+xml</filter>
<filter>text/x-web-markdown</filter>
</plugin>
<plugin name="Imageplugin" class="com.concena.custom.dam.importer.customImagePlugin" order="8">
<filter>image/jpeg</filter>
<filter>image/gif</filter>
<filter>image/png</filter>
<filter>image/tiff</filter>
<filter>image/bmp</filter>
<filter>image/x-ms-bmp</filter>
<!-- RAW images mime type -->
<filter>image/x-canon-cr2</filter>
<filter>image/x-canon-crw</filter>
<filter>image/x-nikon-nef</filter>
<filter>image/x-adobe-dng</filter>
<filter>image/x-panasonic-raw</filter>
<filter>image/x-fuji-raf</filter>
<filter>image/x-sigma-x3f</filter>
<filter>image/x-pentax-pef</filter>
<filter>image/x-kodak-dcr</filter>
<filter>image/x-kodak-kdc</filter>
<filter>image/x-sony-sr2</filter>
<filter>image/x-sony-arw</filter>
<filter>image/x-sony-srf</filter>
<filter>image/x-minolta-mrw</filter>
<filter>image/x-olympus-orf</filter>
<filter>image/x-raw-epson</filter>
<filter>image/x-portable-pixmap</filter>
<filter>image/raw</filter>
<filter>image/x-raw</filter>
<filter>application/illustrator</filter>
<filter>image/photoshop</filter>
<filter>application/postscript</filter>
</plugin>
<plugin name="DefaultFileImporter" class="com.concena.custom.dam.importer.DefaultFileImporterCustom" order="25">
<filter>.*</filter>
</plugin>
</extension>
</component>
The contribution is made in an xml file and included in my Nuxeo IDE build process.
