Canon MX450 series Online Manual page 164

For example, a file name such as "abcdefg.doc" will be "ABCDEFG.DOC", while a name such as
"AbcdeFG.doc" will appear the same.
The file is not actually renamed, but merely appears to be changed.
• Disable the function to write files to a memory card from a computer to read files from a memory
card over a network.