Canon EOS R5 | File Name setting, not correct for image file

[WideAspect]

I've selected the 'wrench' tab page 1 > File name and changed the file name to "IMG_"

Same settings for both 1 and 2 of the User Settings.

Despite this, when I download the images to my computer, the setting is incorrect:

_MG_0113.CR3

Sowing an underscore at the start of the name instead of a capital "I"

Is this a bug?

Also, is there a way to view the filename for an image in camera screen?

Thanks

[WideAspect]

Brian, as a post production specialist, I have worked for years with EXIF data and I still learned something here. Thank you for your thorough response.

More stuff for my brain bag.

[p4pictures]

Thank you. Glad to be of help.