Is there a decompiler for LABView v4-v6

Hello,
One of our customer (Pharma industry) has a compiled LABView application running on Win98 for +10 years. The source code is not available and it seems nobody knows what's under the hood. Based on Win98 dates, I expect them to run a LABView version between v4 and v6.
Is there a decompiler software, any ways to look at the source code or to retrieve some basics information to start reverse engineering.
Thanks for you answers!
Alex
[email protected]
Solved!
Go to Solution.

The whole issue is a little bit more complicated. Before LabVIEW 8.6 the internal executable resource was indeed a LabVIEW VI archive (LLB) and since LLBs have only one hierarchy depth it is basically like a single directory. This caused troubles with the newer LV library based instrument drivers and also LVOOP classes which use the same VI name but with a different library prefix each, so that LabVIEW had to move those files to external directories when building executables, in order to avoid naming collisions.
In all newer LabVIEW versions the internal executable resource in which the VIs are stored is in fact a ZIP file by default. You still can force LabVIEW to use an LLB format to store the files, by enabling the "Use LabVIEW 8.x file layout" in the Advanced build options. Now the ZIP resource was in the beginning stored as simple ZIP formatted data resource and that caused some problems since most ZIP utilities simply scan a file for the ZIP file header and open it as such, even if the actual ZIP file resource is anywhere inside the file, so that almost all ZIP tools could open a LabVIEW executable. NI changed that format so that ZIP tools can not recognize it anymore.
Now, yes you could look into the LLB and ZIP resource in the past (and still can with some extra effort) but before anyone screams "Ohhh my precious IP is on the street" please be aware that the only thing you can do from such a resource is to get the VI names and if you manage to load it into the exactly right LabVIEW version drop the generic icons onto a diagram to see the connector pane. Unless of course you also check the "Enable debugging" checkbox in the Advanced build options, which will leave the diagrams and frontpanels in the VIs, and in fact create something similar to a packed source distributions.
So without the Enable debugging build option, someone gets in fact not much more than what he can do by opening any binary DLL created from C, C++, or whatever mainstream compiler with the dependency tool from Microsoft and MUCH MUCH less than what you can get by simply putting such a DLL through a disassembler.
And to my knowledge there does not exist any disassembler like tool for LabVIEW VIs so far, and I would consider about one billion things more worthwhile to do than attempting to create such a thing.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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