Most applications are not able to open the TIFF file that I scanned. What is the reason?

The problem responding misunderstanding depends on the kind of internal compression of the TIFF-format: most of the time a TIFF-file contains a LZH compression to reduce the amount of data. Because of that nearly all aplications try to open those file by using this LZH uncompress method. Due to some license limits KM-C2630 and KM-C850 use a JPG compression not only for JPG files but for generating a TIFF file, too. Therefore opening the TIFF file in common application will run into error messages.

Solution: if the file extention will be renamed from 'TIF' to 'JPG' the file will be usable as usual.