How To Build exe for Previous Versions

Question

I'm new to LabView and still struggilng a little with all the files associated with a project, so I'm sure this is a simple question.
I'm running LabView v10 for development, but wish to create an exe that can run on a v8.5 runtime version. I've seen the threads that suggest that this is as simple as 'Save For Previous Version'... but for some reason I cannot seem to make this work. I have tried saving the vi for 8.5, then choosing to build the exe, but upon being prompted to create an associated project, I'm told there are unsaved changes - that the subvi's have been converted to version 10. I've tried declining the changes and opting to use those in memory, but this also doesn't work; the built exe then gives me a runtime error, complaining it does not have LV Runtime 10.
I've tried saving the project with 'Save for Previous Version', then building. Again, this doesn't work - even though when i open, then immediately close either the project or it's contained vi's, I'm told there are unsaved changes where it has been converted to LV10 - implying the saved files were indeed saved in LV8.5 format.
I seem to be going round in circles here. Would someone mind laying out the necessary steps to build an exe that can run on a previous runtime environment?
Thanks in advance
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Answer 1

To my knowledge, none of NI's device drivers can have multiple versions co-existing.  Now, that doesn't necessarily mean if you use any hardware that you will run into problems.  If the hardware is NI hardware, then they will also have specific drivers which can be in conflict, but if they are another manufacturer, it'll come down to NI-VISA probably.  If you are using any NI data acquisiton cards, then you have DAQmx installed.
As long as your program doesn't access these devices, you are OK.  You are not required to update the drivers if you don't use the hardware.  You need to look in the relase notes for each of the drivers you need to update and see if you can find a version that supports both 8.5 and LV2010.
Even if you do this, it is not a 100% guarantee that you won't have problems.  I had written an application for a customer once that used NI-RFSA.  I had a control on the front panel based on a typedef in the driver.  I updated my laptop for a new project, but later had to come back and make an update for the original project.  The typedef had changed and caused a recompile.  Nothing broke on my end.  When I sent the update, it crashed on the customer PC because of the typedef change.  I ended up getting them to upgrade the driver on their machine.