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# Windows 95 Err Msg: This Application Has Performed an Illegal...

Article ID: 118539

Article Last Modified on 11/15/2006

APPLIES TO

- Microsoft Windows 95

This article was previously published under Q118539

## SYMPTOMS

When you try to run an MS-DOS-based application, Windows 95 reports the following error message:
This application has performed an illegal operation and will be terminated. Quit all applications and then restart your computer.
The application attempted to execute an invalid instruction. Fault location: 2067:0127.

## CAUSE

Some MS-DOS-based applications load a DOS extender to provide access to memory above the 1-megabyte (MB) range for executable code. Older MS-DOS- based applications may load incompatible versions of DOS extenders and cause the above error.
The following applications are known to exhibit this problem:

       Abraxas versions of Yacc and Lex: PCYACC 3.01 and PCLEX 2.05

## RESOLUTION

Contact the manufacturer of your application to obtain an updated DOS extender.

## MORE INFORMATION

The products included here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: 3rdparty err msg

Keywords: KB118539