Cannot open some pdf files

[Carl Boone]

I'm trying to open and print some pdf files so I can do my year-end accounting work.  There are numerous files that I cannot open with any application.  When I go into Properties > Details  I see that the Attributes Property has a value of ALOM.  The files I can open have a value of AL.

Does anyone know what causes this to occur and if I can change it so that I can open the files?

I'm using Windows 10.

[Test Screen Name · Accepted solution]

I think this may be an offline file in OneDrive. I don't know how files come to be offline, or how you get them back.

[Carl Boone]

Thanks for the response. It prompted me to search for solutions on how to
bring the files back "online". After trying a few things the one that
worked was doing a OneDrive reset.