Learn where Excel and OpenOffice store these files, and how to use both.
What Is an XLB File?
A file with the XLBfile extensionis most likely an Excel toolbar file.

It usesXMLformatting and is most likely calledscript.xlbordialog.xlb.
Skip down to the last section below for more information on that.
OpenOfficecan open XLB files that are OpenOffice.org module information files.
Since they’re XML-basedtext files, you could also read the contents of the file with atext editor.
A new XLB file is created the next time you open Excel.
Still Can’t Open It?
This can make you think it’ll open with the programs above.
Take XLS and XLSX as examples.
XNBandXWBare two other examples.
Or you might give a shot to reset your OpenOffice user profile.
SeeCustom Apache OpenOffice Basic Macros and Librariesfor more on this format.