What does the letter next to the file's date mean?

[Ailothaen]

Hello everyone,

Since a recent update, I can now notice a letter next to the file's date in the window title. I already encountered (m) and (o) :

What do they mean? Are there other status possible?

[fire-eggs]

Exif.DateTimeOriginal (o),
Exif.DateTime, or
File.LastWriteTime (m)

In that order. E.g. file has no Exif data, shows the file's last modified time.

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Added by Phap:
The details is here #687 (comment)