VTrain (Vocabulary Trainer) --- OLE (Object Linking and Embedding)

In VTrain, you can insert multimedia files (images, videos, text, sound, etc.) in your flashcards. In many cases, you can even edit the object directly from the VTrain window!

This is accomplished by way of OLE (object linking and embedding). Screenshot: OLE

This means that, although the objects are visible in VTrain (which acts as an "OLE client"), from a technical point of view, they are actually monitored by an external application (the "OLE server").

Now, which program acts as an OLE server for a given object is determined by the file type of that object. For example, <*.bmp> files are typically displayed in VTrain by Microsoft Paint. In Windows slang you say "the filetype X is registered to the application Y for OLE purposes".

Note not all applications are good OLE servers. For example...

Some servers display the objects in VTrain just the way they are ("direct insertion"), and even allow you to edit them within the VTrain window.
Some servers allow direct insertion only, but no edition, or they can edit the files only in their own window.
Some servers do not even allow direct insertion: the objects are displayed in VTrain as mere icons (you have to double click to 'activate' them).
On the other hand, sometimes when you copy data from a program and paste them into VTrain, they are pasted in a metafile format because the program of origin is not full-scale OLE-compatible.

For this reason, sometimes you may wish to modify the OLE registration of a file type by hand.

For more information about OLE, see the Help file shipped with VTrain.
For a survey of file extensions in Windows, visit FileExt .