Canon 5Dmk4 RAW file viewing codecs ?

I have had luck with irfanview and the Canon CRW plugin. It will read .crw and .cr2 files, including from the 5D4. However, as of now there’s no support for the new .cr3 files from either the M50 or EOS R.
 
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Fast picture viewer works fine for me with windows 10 in Windows explorer for my 5D MK IV files. Its not very fast, but I think its my PC, since jpeg files are also slow to show. I think you need to select Cr2 files in the setup, at least, thats what I did. Its not working with CR3 files for my EOS R yet.

If its not working for you, there is a configuration problem.
 
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Fast picture viewer works fine for me with windows 10 in Windows explorer for my 5D MK IV files. Its not very fast, but I think its my PC, since jpeg files are also slow to show. I think you need to select Cr2 files in the setup, at least, thats what I did. Its not working with CR3 files for my EOS R yet.

If its not working for you, there is a configuration problem.
I have got it working with Fast picture viewer thank you ! 8 pound well spent
 
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