Do you need to change file extension (from which one)
Or just change file name?
In second case, please use (check) setting Preferences - Performance - Flush decoded RAW/JPEG caches on file/folder forced reload and use Menu - File - Reload - Reload current folder to refresh/reload folder.
Most probably problem source: your application(s) start to write to JPEG file. FastRawViewer sees the file immediately, tries to get it contents and fails because file is not completely stored (or locked). This failed state is remembered in file cache.
Could you please explain the
Could you please explain the problem:
In second case, please use (check) setting Preferences - Performance - Flush decoded RAW/JPEG caches on file/folder forced reload and use Menu - File - Reload - Reload current folder to refresh/reload folder.
Most probably problem source: your application(s) start to write to JPEG file. FastRawViewer sees the file immediately, tries to get it contents and fails because file is not completely stored (or locked). This failed state is remembered in file cache.
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Alex Tutubalin/FastRawViewer team