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Is the original labview code stored in *.llb file?

I have been approached by a customer who wants to retrofit their Labview application with Wonderware.  I am trying to determine if they have the Labview source code, so that the protocols between Labview and two printers can be duplicated.  It looks to me like they have some sort of a distribution kit.  Can anyone tell me if the original source code for a Labview application would be stored in a series of *.llb files? 
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Yes, LLB file stores files with extension .vi that are the source.  Most newer applications don't use the .LLB any more.  Can't figure out why they would want to leave LabVIEW.

Matt

Matthew Fitzsimons

Certified LabVIEW Architect
LabVIEW 6.1 ... 2013, LVOOP, GOOP, TestStand, DAQ, and Vison
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