Both methods for 'export' file into Lightroom (Run external program and drag-n-drop) does not touch the original file, so if one of these methods were used: your file is still in place.
Also, FastRawViewer never deletes files without an extra step (Clear the Rejected folder), so if you accidentally used 'Move to _Rejected' action - your file is in _Rejected folder.
Both methods for 'export'
Both methods for 'export' file into Lightroom (Run external program and drag-n-drop) does not touch the original file, so if one of these methods were used: your file is still in place.
Also, FastRawViewer never deletes files without an extra step (Clear the Rejected folder), so if you accidentally used 'Move to _Rejected' action - your file is in _Rejected folder.
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Alex Tutubalin/FastRawViewer team