If you want to store the physical contents of the file without using a general field then you can use a memo field and the filetostr() function.

lcRawData = filetostr("c:\test.bmp")

insert into imagetable (imagememo) values (lcRawData)

To get the image back use the complementary strtofile() function.

lnBytesWritten = strtofile(imagetable.memo, "c:\test2.bmp")

However I prefer to store the path to the file as opposed to the physical contents in a memo.