IO error for file "C:\Program"...

[Belinda Frick]

The problem that you are having is a result of the shortcut that is used for
starting the Ruby server. This problem has already been addressed in a newer
version of Ruby

Just open the shortcut to your Ruby server ( Select properties)
In the target it should have the location of the executable and then a space.
After the space in double quotes, put the location of your Ruby Database.
(format: server_name:path_to_db_file)
It should look like this gem:c:\program files\datatex\ruby2\data\ruby.gdb
you can check that the file is in that location and just change the string to
the correct value.

If this is correct, use that shortcut to start the Ruby.