Istvan Gabor wrote:
Hello list users:

How kde decides (konqueror, krusader) the type of a file?
Sometimes the file's icon in krusader does not correspond to the extension.

that's because file extensions can be anything -- and
file "type" (i.e. what programs can use it) is NOT
determined of the operating system -- that's for you,
the user to decide, and exercise in any way which you
want.(*)

I can make a JPEG format file, and call it "picture.doc",
and even KDE should be able to tell that it's a JPEG
formatted file, not a Microsoft Word document.

Or you can just call your JPEG file  "picture",
without any tag letters at all.


A file's type is determined by the internal structure
of it's contents, NOT by any suffixes.

for more explanation, read up on the "file" command:

man file


(*) there really aren't any different types of
data files on Unix and Linux... the only different
TYPES of files recognized by system are "regular"
files, named pipes, sockets, directories, symbolic
links, and the "block special" and "character
special" device drivers found in /dev.





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