libolecf is a library to access the OLE 2 Compound File (OLECF) format.
The OLE 2 Compound File format is used to store certain versions of Microsoft Office files, thumbs.db and other file formats.
Download from Github.
git clone https://github.com/libyal/libolecf
Note: that the git repository holds the development version of the source code.
If you are not developing it is recommended that you download a source package instead.