Reopened Issue: Update-Database -Script is broken [1100]

Repro:
Create basic console application
PM> Install-package entityframework -pre -version 6.0.0-beta1-20502
PM> Enable-Migrations
PM> Add-Migration a
PM> Update-Database
add property to entity
PM> Add-Migration b
PM> update-database
PM> update-database -targetMigration a -script

EXCEPTION:
PM> update-database -TargetMigration a -script -Verbose
Using StartUp project 'IssueMigrationsRepro101x'.
Using NuGet project 'IssueMigrationsRepro101x'.
Target database is: 'IssueMigrationsRepro101x.EntityContext' (DataSource: .\SQLEXPRESS, Provider: System.Data.SqlClient, Origin: Convention).
Reverting migrations: [201305022224295_b].
Reverting explicit migration: 201305022224295_b.
System.Runtime.InteropServices.COMException (0x8004000C): User canceled out of save dialog (Exception from HRESULT: 0x8004000C (OLE_E_PROMPTSAVECANCELLED))
at EnvDTE.ItemOperations.OpenFile(String FileName, String ViewKind)
at System.Data.Entity.Migrations.Utilities.DomainDispatcher.OpenFile(String fileName)
at System.Data.Entity.Migrations.Utilities.DomainDispatcher.OpenFile(String fileName)
at System.Data.Entity.Migrations.Extensions.ProjectExtensions.NewSqlFile(Project project, String contents)
at System.Data.Entity.Migrations.UpdateDatabaseCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
User canceled out of save dialog (Exception from HRESULT: 0x8004000C (OLE_E_PROMPTSAVECANCELLED))