Trying to run a Smalltalk/V for Windows 2.0 (or earlier) runtime under
WIN/OS of OS/2 2.0 returns system error about sharing violation on
VWSIGNON.DLL.  Sign on windows comes up, then loading aborts.   Filein the
following method to resolve:

!SystemDictionary methods !
   
signonDLL
        "Answers the signon DLL's file name embedded in the
         image.  When the Smalltalk runtime application
         ( the image) is executed, the signon DLL specified in
         aString will first be loaded before the application is started
         up."
    | aFile answer string |
    aFile := File pathNameReadOnly: self imageName.
    aFile atEnd
        ifTrue:[ aFile close ]
        ifFalse:[
            aFile position: 16r1212.
            ( aFile next = $S and: [ aFile next = $F ] )
                ifTrue: [
                    answer := aFile upTo: ( Character value:0 ).
                    aFile close.
                    ^answer ]
                ifFalse: [
                    aFile close.
   ^self error: 'Could not find signon file name signature characters' ] ]! !