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Profile copy to external HD stops with msg "are you sure you want to copy this file without its properties" Proper response? Yes, Skip, Cancel???

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Trying to copy profile folder to external hard drive for backup using Window 10 copy/paste. Process stops repeatably to ask if I want to copy the file without its properties. See screen shot.

Trying to copy profile folder to external hard drive for backup using Window 10 copy/paste. Process stops repeatably to ask if I want to copy the file without its properties. See screen shot.
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A wdseml file is a partial copy (up to 49KB) of a message in the mail folder, stored in a .mozmsgs subdirectory. It is used by Windows Search Integration (requires Vista or a later version of Windows). They're actually renamed .eml files. You can disable this feature by unchecking Tools -> Options -> Advanced -> General -> System Integration -> "Allow Windows Search to search messages".

I don't know what properties Microsoft is adding to the file which would get lost upon copying.

In any case, it should be safe to simply say 'Yes'.