Maya vector field export not working

When I try to export a vector field from Maya 2012 x64 I keep getting this error:
// Warning: line 124: fopen: unable to open file “C:\vel.165.fga” for mode “w”.

I had no issues with this on my last computer, using the same version of Maya and the same OS (windows 7). I have looked at many tutorials and followed them all to a “T” Including this one: A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums

I’ve tried changing the export path name to my other drive and I’ve even tried the shelf files from several versions of UE4. 4.0, 4.6, 4.7, 4.9. Nothing works.

This is the original tutorial I was using: imbueFX - Intro to GPU & Lit Particles in Unreal Engine 4 - Chapter 02 - YouTube

Setting the export to my external drive fixed the problem. Internal drives must not work for some reason.