EffectivePerms.ps1

# https://gallery.technet.microsoft.com/scriptcenter/PowerShellAccessControl-d3be7b83#
Import-Module PowerShellAccessControl

# Find files/dirs recursive | grab their ACL | Special effective perms module, grab all rights for our user | select only objects with write perms | show the path to the object
gci -Recurse c:\ | Get-Acl | Get-EffectiveAccess -ListAllRights -Principal $Env:USERNAME |? {($_.Permission -eq 'Write')} |% {$_.DisplayName}