Change file content on TFS with MSBuild

I have a checked-in file in the TeamBuildTypes folder beside my MSbuild proj file, the file contains the next build version number.

what I do is to read the version number and set it as the drop name using the BuildNumberOverrideTarget msbuild task, what I need to do is to change this checked-in file content to hold the next version number so I can use it in the next build. is it possible to do it?

T-O-M