Cannot open folder
$ ./cudaHashcat-plus64.exe -a 6 -m 2500 test.hccap test ?d?d?d
cudaHashcat-plus v0.14 by atom starting...

Hashes: 1 total, 1 unique salts, 1 unique digests
Bitmaps: 8 bits, 256 entries, 0x000000ff mask, 1024 bytes
Workload: 16 loops, 8 accel
Watchdog: Temperature abort trigger set to 90c
Watchdog: Temperature retain trigger set to 80c
Device #1: GeForce GTS 450, 1023MB, 1844Mhz, 4MCU
Device #1: Kernel C:\cygwin64\home\mangix\programs\cudaHashcat-plus/kernels/4318/m2500.sm_21.64.ptx

ERROR: cannot open 'test' (13) : Permission denied

The folder name is test. I've tried everything I can think of(changing folder permissions, creating the folder on another drive, using an administrative command prompt, using cygwin) but nothing. hashcat is the only program that is having issues. Everything else that I tested works(notepad and cat mostly).

This is on windows 8 64-bit.

The test folder has output generated from the splitlen utility found in hashcat-utils.
If test is a directory, then the error message is correct, since you are using -a 6 mode not -a 0 mode which does not support scanning of directories and instead tries to load a file.
That would explain it. Thanks for the reply.