Windows app not seeing file changes, cache issue?

[inthedamwitit]

I have a windows .exe that reads a file every now and again (a fairly plain text file containing some data).
The program simply uses fopen, fread, fclose API's.

However, no matter how many times I edit said file, the program still reads the old data.
Even if I delete the file, the program still reads the old data.

This leads me to believe there's some kind of caching going on somewhere. I have tried to rule out the harddrive/OS by running every possible sync/flush command I can find on google, so that leaves WINE.

How can I disable this behaviour so my program can open a file and read its latest data?