Hi Super-Chub,
from what you are saying you don't have the source code for your application, right? Couldn't you find the original developer and either ask him the description of the data files data file or have him write a small application to translate them?
From the file alone it is difficult to understand which data is saved on it and how; .dat extension does not identify a specific file type. From a fast glance to the file you attached, I seemed to recognize a 36-byte pattern with embedded 4 spaces that repeats throughout the whole file, but no more than this. Based on your knowledge of the application you may try to guess which type of data is stored in each file and possibly how data are organized in it.
One could try to decode the file based on the assuption it was produced by ArrayToFile function, but I can't remember whether CVI 4 was already having that function and how it was organized; moreover the 4-spaces field seem to contrast with the use of such function. It could also be the dump of an array of structures... Anyway, I am just throwing out some idea that may help you in this task.
** Edit: I just saw in the online help that ArrayToFile function is present in CVI from release 4.0.
