If you are trying to open a VI created in 7.0 with and earlier version of LabVIEW, you have to go through a step down process.
LabVIEW can save a VI to the previous version of LabVIEW only. So if the VI was saved in 7.0, then it can be saved to 6.1. Then the VI must be opened in 6.1 and saved down to 6.0. One thing to remember here is that the newer versions contain new features that did not exist in the earlier versions, so down saving like this may or may not give you a working VI. It depends on what's in the code. To save to a previos version, open the VI in the correct version of LabVIEW, then go to the File menu and select "Save with Options...". In the dialog on the left hand side you will see a selection for "Save for Previous". Click this selection and follow the prompts to save your VI. This will also save all the sub-vis of the top level VI. Ed
