These are thumbnail files. I’ve had luck using XnConvert to do the conversion.
Field: slightly worse image, no interlacing artefacts
Frame: slightly better image, interlacing artefacts (moving things get shredded)
Put a ribbon or floss around the battery first so you can pull it out later.
exiftool \
"-datetimeoriginal<filemodifydate" \
-make="SONY" \
-model="MAVICA MVC-FD7" \
-EXIF:OffsetTime*=+8:00 \
.
exiftool -geotag track.gpx \
. \
-api GeoMaxIntSecs=1800 \
'-geotime<${DateTimeOriginal}+08:00'
exiftool \
"-datetimeoriginal<filemodifydate" \
-make="SONY" \
-model="MAVICA MVC-FD7" \
-EXIF:OffsetTime*=+8:00 \
. \
&& exiftool \
-geotag track.gpx \
. \
-api GeoMaxIntSecs=1800 \
'-geotime<${DateTimeOriginal}+08:00'