Win 8.1 in Program Compatibility Mode lose keyboard input

I have a problem with Windows 8.1 Prof. 32-bit using Compatibility Mode. I am programmer, my aplications are Clipper programs ( Clipper 5.01 and
Blinker 6.0) and they work fine on early versions of Windows. On Windows 7 Prof. 32-bit, I noticed that program sometimes loses input from the keyboard during long actions, for example: reading of big disk file and creating new working file. That means, keyboard stop working for task with my program, but not for the other activ programs in Windows. I tried to use Compatibility Mode and after long testing I recognized that Compatibility Mode Windows 98/Me can resolve my problem. Other Compatibility Modes did not resolve problem. What is magic in Win 98/Me Compatibility Mode ?

I use that Compatibility Mode for .BAT files ( not for .EXE files ) and everything is OK. That was on Windows 7 Prof. 32-bit. On Windows 8.1 Prof. 32-bit problem can not be avoided: start program without or with any Compatibility Mode occurs same problem. Compatibility Modes in Win 8.1 are not for .BAT files, so I used Compatibility Mode with .EXE files.

None of the compatibility modes are enough. There is still randomly stoping input from the keyboard. That means: program sometimes work fine during several starts and finish regulary without losing keyboard input. But, sometimes same program with same datas can work once or two times. When that happens, I have to end task by click X-buttom of window because keyboard dont work any more.

This test was on Laptop Lenovo G500 with 4 GB memory and two 500 GB disks. I have regulary installed Windows 8.1 Prof. 32-bit and all Windows Updates are successfully instaled. NTVDM.exe is succesfully instaled 20.2.2015. ( NTVDM.exe is 526848 bytes and NTVDMD.dll is 14848 bytes on C:\Windows\System32 ). Same problem is on other computers with Win 8.1 , so I think problem is in the operating system.Do You have any ideas how to solve this keyboard problem od Win 8.1 ?

Can You find Microsoft Windows 8.1 specialist for NTVDM who can analyze the behavior of Windows in this problem ?
May 9th, 2015 10:54am

Hi,

For this problem, in my opinion, you can try to use Application Compatibility Toolkit analyze your program, this should be helpful to find the deep compatibility problem with your app.

https://www.microsoft.com/en-us/download/details.aspx?id=7352

Access to the link below for more details:

https://technet.microsoft.com/en-us/windows/application-compatibility.aspx?f=255&MSPPError=-21472173

May 11th, 2015 5:24am

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