"Original" hidden extensions.cfg may look like this:
Code:
hrss:@HTML_file:1:browser.app:ICON_HTM
mhtml:@MHTML_file:1:browser.app:ICON_MHTML
jpg:@JPEG_image:2:picviewer.app:ICON_JPG
jpeg:@JPEG_image:2:picviewer.app:ICON_JPG
png:@PNG_image:2:picviewer.app:ICON_PNG
bmp:@BMP_image:2:picviewer.app:ICON_BMP
tif:@TIFF_image:2:picviewer.app:ICON_TIFF
tiff:@TIFF_image:2:picviewer.app:ICON_TIFF
file:@MENCA_file:1:menca_downloader.app:ICON_MENCA
txt:@Text_file:1:eink-reader.app:ICON_TXT
fb2:@FB2_file:1:eink-reader.app:ICON_FB2
htm:@HTML_file:1:eink-reader.app:ICON_HTM
html:@HTML_file:1:eink-reader.app,browser.app:ICON_HTML
chm:@Z_HTML_file:1:eink-reader.app:ICON_CHM
rtf:@RTF_file:1:eink-reader.app:ICON_RTF
doc:@DOC_file:1:eink-reader.app:ICON_DOC
docx:@DOC_file:1:eink-reader.app:ICON_DOCX
docm:@DOC_file:1:eink-reader.app:ICON_DOC
prc:@PRC_file:1:eink-reader.app:ICON_PRC
pdb:@PRC_file:1:eink-reader.app:ICON_PRC
mobi:@PRC_file:1:eink-reader.app:ICON_PRC
tcr:@TCR_file:1:eink-reader.app:ICON_TCR
pdf:@PDF_file:1:eink-reader_with_pdfium.app,eink-reader_with_rmsdk.app:ICON_PDF
epub:@EPUB_file:1:eink-reader.app:ICON_EPUB
acsm:@ACSM_file:1:eink-reader.app:ICON_ACSM
djvu:@DJVU_file:1:eink-reader.app:ICON_DJVU
djv:@DJVU_file:1:eink-reader.app:ICON_DJVU
cbr:@CBR_file:1:eink-reader.app:ICON_CBR
cbz:@CBZ_file:1:eink-reader.app:ICON_CBZ
app:@APP_file:4:start.app:ICON_APP
run:@APP_file:4:start.app:ICON_APP
lndrm:@LNDRM_file:1:libronet_switcher.app:ICON_LNDRM
pbi:@APP_file:1:sysinstall.app:ICON_APP
pn:@PN_file:1:pb_file_handler:ICON_PN