Hello!
My os is Windows 7 home edition.
When I try to open .heic file with polish language characters ("ą", "ł") in file path or file name I get an error - window titled "heif_context_read_from_file" with text: "Input file does not exist: Unspecified: Error opening file: No such file or directory (2)" and program doesn't show picture.
In other cases (no international characters) everything works ok.
I hope you can crush that bug :)