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Dear Sir:

It may happen that you have a 'ghost' (mounted, but not connected) network drive, for example your NAS is turned off, but the drive letter remains in the system.

Please reboot, then download and install FastRawViewer 2.0.4 https://updates.fastrawviewer.com/data/FastRawViewer-2.0.4.1912-x64-Setu...

Before starting it, please go to Windows Start Menu - LibRaw - FastRawViewer and execute ReducedFoldersFunctions script. There will be two prompts, Registry Editor start and Registry change,  please confirm both.

Try starting FastRawViewer now.