"Resource not available" error message fixed in MinimServer update 248

[Charles7]

It gets worse, much worse. A Windows 10 update was on deck, so I restarted the PC and let it happen.
Normally after an update, I launch Minimserver by clicking on a shortcut which goes ot
"C:\Program Files\MinimServer\lib\mserver.jar"
But now Minimserver does not start. The click simply takes me to a .jar file. (screenshot attached) The same thing happens if I try to start Minimserver from Windows Start.
After this Windows update, Microsoft's Files program is intrusive in place of Explorer. I hadn't noticed it previously. The attached screenshot is cropped from a Files window.

The minimserver log shows:
MinimServer: exception while processing HTTP request: java.net.SocketException: Software caused connection abort: socket write error
java.net.SocketException: Software caused connection abort: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(Unknown Source)
at java.net.SocketOutputStream.write(Unknown Source)
at org.jminim.lib.HTTPContext.sendResponse(HTTPContext.java:184)
at org.jminim.lib.HTTPContext.errorResponse(HTTPContext.java:136)
at com.minimserver.ServerConfigHandler.writeResource(ServerConfigHandler.java:3027)​
at com.minimserver.ServerConfigHandler.processRequest(ServerConfigHandler.java:314)​
at org.jminim.lib.HTTPConnection$WriterThread.runWriterThread(HTTPConnection.java:4​75)
at org.jminim.lib.HTTPConnection$WriterThread.run(HTTPConnection.java:430)
ending MinimServer
Converter program ended unexpectedly with exit value 1073807364
stopping MinimServer[JohnDoePC]
MinimServer[JohnDoePC] is stopped