Hi! Reflector,
I highly encourage you to upgrade your LabVIEW to a more recent version. That way it will be much easier to find help, KB articles, tutorials, etc.
I tried to use my version of LabVIEW's help and error explanations. This is what Error -43 explanation says:
"Error -43 occurred at an unidentified location
This error code is undefined. Undefined errors might occur for a number of reasons. For example, no one has provided a description for the code, or you might have wired a number that is not an error code to the error code input.
Additionally, undefined error codes might occur because the error relates to a third-party object, such as the operating system or ActiveX. For these third-party errors, you might be able to obtain a description of the error by searching the Web for the error code (-43) or for its hexadecimal representation (0xFFFFFFD5)."
Now... I am not 100% sure if Labview has the same error codes for LV3.1.1 and LV2017, which is the version I have.
Also, I could not find the *.vi you make reference ("open, read abc, close" vi). But I found this article for error 43 on an Open/Create/Replace File VI <http://digital.ni.com/public.nsf/allkb/E78D4D60B08E4CCE86257297005BB706>
I hope this information is useful!
