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Dear Sir:
Are you using the current version of FastRawViewer? Do you have "HEIF/HEIC files support" checked in FastRawViewer Preferences, "File Formats"? If so, and .HIF files are still not displayed, please upload a sample HIF file showing the problem to any file exchange service (some of the free ones are Dropbox, Google Drive, WeTransfer) and send the link to