unable to attach files on window, i get the error, Attachment not in allowed path

I'm unable to attach files on window, i get the error, Attachment not in allowed path

I'm unable to attach files on window, i get the error

    Attachment not in allowed path: private://final/report.pending.030126_0.pdf

the allowed paths is set to 

    private://final/*

the patterns failing comparison in pcreFnmatch end up being the below,

    string: C:\Workspace\Apache24\htdocs\sites\default\files\private\final\report.pending.030126_0.pdf
    pattern: #^C\:\\Workspace\\Apache24\\htdocs\\sites\\default\\files\\private\\final/[^/]*$#i

Steps to reproduce

using php $email->setAttachmentIds([$fid]) to add the attachment with the #fid

Proposed resolution

i wonder if its never been tested on windows, just linux. may need to handle windows paths

Remaining tasks

User interface changes

API changes

Data model changes