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Dear Sir:

FastRawViewer do not alter RAW files in any way. Files are always opened in read-only mode to ensure that.

This is intentionally: today media, esp. removable media (USB readers, USB disks, etc) is prone to error, so editing (unique) RAW files could result in (unique) images lost.

There are a lot of EXIF editors (but we always suggest to backup your files before any editing)