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I use Bentley's OpenRoads Designer software as well as FrameMaker 2017. These two seem to be stomping on each other's dll files. The most likely suspect is TBB.dll.
Symptoms of the problem are that one program will run fine, until I start the other program. Then the first program fails with an error that the dll is invalid. I reinstall the broken program only to find that the first one is now broken.
I really don't care whose fault it is but does anyone have a fix?
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Never heard of it - are they each installing different versions of the DLL? If so, I would reach out to whichever is using the oldest version to make a change to their system.
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Sounds like you need to open a support ticket with both Bentley's OpenRoads Designer, and with the Fm team.
Other than separating your work using virtual machines or separate boxes, that is...
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What version of Windows is this?
XP, 7, Vista, 10, 32 or 64-bit
(that mainly influences the work-around options)
Microsoft supposedly solved the "DLL hell" problem over 15 years ago, so this report is somewhat surprising.
Matt's VM suggestion would work, but is a lot of work. Re-installing both in a specific order might be worth a try. Reinstalling one or both in Compatibility Mode might be worth a try. Reinstalling as different (admin-capable) users on the same machine might be worth a try.