Object library that contains data types and constants referenced by MS Office components; may cause certain Microsoft programs to not function correctly if moved or renamed.
OLB files are also referred to as Office Object Library files.
Program(s) that open olb files
Windows: Microsoft Word; Microsoft Excel; Microsoft PowerPoint; Microsoft Project; Microsoft Visual FoxPro; Microsoft Visual Studio
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/olb
