now i fill arc.groups with extensions for the following file groups:
1) cd image (like *.iso)
2) music module (like *.mod)
3) zip/gz-compressed files (for precomp)
4) jpeg files (for PackJPG)
5) unpacked bitmapped grahics
6) unpacked wave sound files
my current list is:
$iso
*.bin
*.iso
$bmp
*.bmp
*.tif
*.tiff
*.tga
*.wbm
*.wbmp
$wav
*.wav
*.wave
*.pcm
*.aif
*.aiff
*.au
*.snd
$mod
*.stm
*.mod
*.s3m
$zip
*.swf
*.zip
*.jar
*.png
*.gz
*.tgz
*.svgz
*.docx
$jpg
*.jpg
*.jpeg
if you know any more extensions of files belonging to these groups, please write here