What does it mean if a software version includes hex values?

[NCOX]

Typcially I use NI-MAX (measurement and automation explorer) version 5.10f0 at my workplace.

I downloaded a version of NI-CAN for testing and the software package came with NI-MAX version 5.1.

What does the extra hex value "0f0" on the version mean? The hex value doesn't seem on par with traditional naming conventions for updated software versions. I can't seem to find any details on the website that could list the differences (if any). 

Could somebody give me some insight into what that hex value means? Are both versions technically identical?

[NCOX · Accepted solution]

SOLVED:

After talking with a friend who works at NI, I was able to gather this information:

"0f0" isn't a hex value, it's a build phase identifier that means "final", as in the final build. 

Software released by NI should always be a good version.

Some builds may list the phase while others do not (despite being the same product and same version).

Essentially, Version 5.1 and 5.10f0 are identical.