Currently Navision database only store bmp file but in version 5.0 it can handle other than bmp. just use search the forum, there are many topics to your question.
another way is if all your pics are JPG you could use pixresizer to convert all of them into bmp with 1 click. then import them as needed as discussed here http://dynamicsusers.org/forums/thread/1415.aspx
Comments
Just go to the company information.There change the format from *.bmp to *.jpg in the import menu button....then it'll work.
rgds,
sea-navision-community-subscribe@yahoogroups.com
detail in:
http://sea-navision-community.blogspot.com
http://www.mibuso.com/dlinfo.asp?FileID=573
http://dynamicsusers.org/forums/thread/1415.aspx
http://www.BiloBeauty.com
http://www.autismspeaks.org