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GTA V version?
Build 1604.1
Up to date?
Yes
Legit or Pirate copy?
Legit
Steam/CD/Social Club?
Steam
Windows version?
Windows 10 Professional 1804
Did you try to delete caches.xml and try again?
Yes
Error screenshot (if any)

System specifications
i7-7700, nVidia 1070, 32GB ram (not sure what else you may need)
What did you do to get this issue?
Started FiveM.exe
What server did you get this issue on?
n/a - cannot get to any server or option (see more detail below)
CitizenFX.log file
.dmp files/report IDs
CfxCrashDump_2019_04_10_02_47_25.zip (40.5 KB)
If an issue with starting:
GTA V folder screenshot
GTA V/update/x64/dlcpacks screenshot
Filepath to FiveM folder
D:\FiveM\
FiveM client folder screenshot
Did you try to disable/uninstall your Anti-virus?
I have tried whitelisting the FiveM application data and D:\FiveM folders for Windows Defender
Also add what you already tried so far.
Special case scenario: Once I get the initial crash from opening FiveM.exe, as long as I do not close the error message dialog, I can open another instance of FiveM.exe and it works (although the launcher interface is sluggish to respond but the game plays normally).