Finding the offset of a string in a file

I have a BTM which will start DEVENV with the most recently used .SLN file as an argument (avoiding the pick_a_project dialog). AFAIK, that info is only recorded in a file named "ApplicationPrivateSettings.xml", buried deep in the %APPDATA folder. I can get the file name with FFIND (or WHERE.EXE). After that I must find the first occurrence of the string "FullPath" in the file. I can do that with @FILEREAD (et al.) but searching about 10,000 bytes into the file is rather slow (about 3...

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