I have a problem in the replacement you are doing in sourceName property. The "." replacement has been doing only inside files replacements (text), but not in file names.
My problem is that I'm using the sourceName to create a solution file:

Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BlankProject", "BlankProject\BlankProject.csproj", "{7CF740F7-735F-48EA-8B7B-3FFA4902371C}"

After generation (sourceName = 'Blank.Project') I get:

Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Blank_Project", "Blank_Project\Blank_Project.csproj", "{7CF740F7-735F-48EA-8B7B-3FFA4902371C}"

but the folder & project file name is Blank.Project\Blank.Project.csproj

Is there a way to not have this replacement?

Thanks!!