The InfoPath form's 'Attachment control doesn't work with SharePoint Workflow forms.

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When we use InfoPath form as a workflow form with an attachment control, on selecting a file says that “The selected files was not found”.This seems to be a small bug:) in the product.

Note: It's not advisable or supportable to customize out of box files (comes with the SharePoint installation). There is a possibility that these files be overwritten in a future service pack, thus losing your changes.

 

Work-around:

a. Locate the ASPX page that your workflow form opens up in the _layouts directory on your server.

e.g., %Program Files%Common Files\Microsoft Shared\Web Server Extensions\12\TEMPLATE\LAYOUTS  

 b. In this aspx page, locate the reference to MasterPageFile. This will look something like

MasterPageFile="~/_layouts/application.master"

c. Now open the masterpagefile that you found above in notepad and locate the form tag.

d. Add the attribute enctype="multipart/form-data" to this tag and save.

e. iisreset and try your workflow with file attachment again.

 

Hope this works!!!