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FSX XMLTool.dll does not load/work.. Resolved

I have been using XMLVars extensively for my gauges for Beechcraft King Air350. Recently I read about XMLTOOLS which has XMLVARS plus additional functionalities. I downloaded and followed the instructions to the letter. I wanted to try and use specifically XMLKEYs and hence used the existing example gauge: KeysHandler for B737-800. The spacebar that is supposed to turn on/off reverse thrust doesn't get activated at all - the XMLKeys and XMLTABLES are not working. The msg remains "Reverse Thrust Disabled". Also the existing gauges that use XMLVars for my BAK350 also stopped working after the installation of XMLTOOLS. Just to be sure I double checked that dll.xml does not contain any reference to XMLVARS. I completely removed XMLVARS but with no luck. I logged in as Administrator on my system and did the installation of XMLTOOLS ( where XMLVARS has not be installed) but with no luck. I put back XMLVARS and removed XMLTOOLS and my BA-K350 gauges that used XMLVARS started working. I again did the complete removal of XMLVars and installed XMLTOOLS - again no luck

1.DLL.XML - checked
2. Checked XMLTOOLS.xll in main folder of FSX
3. Checked the version of XMLTOOLS v201
4. Checked for VC redist x64

Any ideas? what I'm missing?


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  • screenshot - XMLTOOLS version .png
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  • screenshot - vcredistx64.png
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Sorry forgot to mention OS: windows 11/FSX


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Problem resolved! Appropriate Simconnect was not loading. I found this by looking at the windows event log. Played around with side by side (winsxs) folder containing multiple versions of Simconnect and also making fsx run under compatibility mode made it work