To fix this edit the registry like so:
In Computer\HKEY_CLASSES_ROOT\.vala
Create a new string key: "Content Type" (without quotes)
Edit the value and change it to: text/plain
To fix this edit the registry like so:
In Computer\ HKEY_CLASSES_ ROOT\.vala
Create a new string key: "Content Type" (without quotes)
Edit the value and change it to: text/plain