title: Excel Add in VSTO don't work when other XLA add in are installed
body: <p>I have developed an Excel Add in with C#, and was working fine.
  But since i had installed another Add in written in VBS in XLA file, my C# Add in doesn't work anymore...
  Does anyone faced this situation before? how can i proceed to resolve that?
  Can i create an XLA file fore my add in to force it loads?
  Best regards
  Sabri,</p>