Error when launching installer from network path

[Anders]

#define _LANG_CANTOPENSELF _T("Error launching installer") and it looks like that can only happen when it is unable to open itself, to be precise, the call to CreateFile with GENERIC_READ,FILE_SHARE_READ,OPEN_EXISTING fails. (This message is always in English)

A error like this can be caused by anti-virus software but I cannot really understand why they would block a read request.

I'm guessing it is one of these two issues:

A) Accessing the file over UNC is slightly slower or handled differently in the kernel so the AV software steps on our toes.

B) We end up using the wrong path for some reason, not sure why that would happen but there might be network, virtualization and file redirection going on.

It would really help if we could get a Process Monitor log so we can at least find out if the open operation fails with access denied, not found or even some other error.