There is only one file type that uses the .WLB extension:
WinList Protocol Bundle
Protocol bundle file used by WinList, a flow cytometry analysis program; contains a .WLX file in a Zip-compatible format; includes copies of FCS data files that are used in the setup.
NOTE: Protocol bundles are designed for users looking to share WLX files with other users.
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Updated: May 21, 2015