Cannot mount ISO file in Windows 11

[Barstuck]

My laptop came with Windows 11 Pro.It will not mount an ISO file.I've right-clicked, selected "mount", get the spinning wheel for a while, then get a message that there is an error mounting the file.Tried right-clicking and selecting Open With... Windows Explorer. Same result.Tried disabling 'Check Apps and Files' under "Windows Security/Reputation Based Protection". Doesn't work.The file CAN be opened in VLC or other app (when it's a video file), so it is not the file (tried several).The files also mount fine on my other PC which has Windows 10.

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