Find and replace at powershell
===

My textfile looks like this:

    -------------------
    Set PRGVER="V1.0.12"
    Set PRGDIR=C:\PRGSTD\oif_mes\OIFplus
    Set PRGEXE=OIFplus.bat
    Set PRGTXT=OIFplus

    echo %PRGTXT%, %PRGVER%
    start "%PRGTXT%" /D%PRGDIR%\%PRGVER%\ %PRGDIR%\%PRGVER%\%PRGEXE%
    ----------------------

What I wan't to do, edit this file, only change Set PRGVER="V1.0.12"` to a new number,  like this Set PRGVER=V1.0.13"`.
When is start the PS Script, I dont' know the whole string, the number between ""
I only know, find string variable: Set PRGVER="".

How can i replace only the first value between " "?

I hope somebody can help me,

Horst