There are several applications known, which causes the crashing/hanging on the file dialogs:

  1. Adobe Drive (part of Adobe CS3 & CS4)

  2. Symantec Endpoint Protection

  3. TortoiseSVN

  4. MediaPortal / Dokan Library Bundle

  5. Cryptomator (WinFsp component)

They install drivers/thunks into Windows, which causes EAC to hang. Please check the internet for possible solutions for any of the given applications (if a deinstall is not feasible).