You need to modify 3 files: CategoriesItemsPart.xsl, FolderItemsPart.xsl
and SearchResultsPart.xsl.

Open these files in notepad and do a search for </xsl:otherwise>, there
will be multiple hits. You need to find  the one that looks similar to
what is shown below:

</xsl:otherwise>
</xsl:choose>
</xsl:attribute>
<xsl:attribute name="id">
<xsl:value-of
select="dav:propstat/dav:prop/dav:displayname"/>
</xsl:attribute>

Add in the 3 red lines:

</xsl:otherwise>
</xsl:choose>
</xsl:attribute>
<xsl:if test="dav:propstat/dav:prop[dav:iscollection != '1']">
<xsl:attribute name="target">"_blank"</xsl:attribute>
</xsl:if>
<xsl:attribute name="id">
<xsl:value-of
select="dav:propstat/dav:prop/dav:displayname"/>
</xsl:attribute>

You need to do this for all 3 files.

You need to change this line in searchresult.xsl file
u can place on line 284 or after that the full code is pasted below

the same thing u need to do for other two files CategoriesItemsPart.xsl,
FolderItemsPart.xsl as well
hope this answers ur query

<A><xsl:attribute name="href">
<xsl:choose>

<xsl:when test="dav:propstat/dav:prop[pub:ShortcutTarget!= '']">

<xsl:value-of select="dav:propstat/dav:prop/pub:ShortcutTarget"/>

</xsl:when>

<xsl:when test="dav:propstat/dav:prop[pub:DiscussionTarget != '']">

<xsl:for-each select="dav:propstat/dav:prop/pub:DiscussionTarget">

 <xsl:eval>

 var strSub=this.text.substr("http://./msoffice/commfrms.asp?url=".length);

 strSub=strSub.replace(/http:\/\/./, "");

 strSub=canonicalizeForUrlParameter(canonicalizedUtf8FromUnicode(strSub));

 strSub="/msoffice/commfrms.asp?url=".concat(strSub);

 strSub;

 </xsl:eval>

</xsl:for-each>

</xsl:when>

<xsl:when expr="fIsAMajorVersion">

<xsl:eval>g_strActualBaseDocUrl;</xsl:eval>

</xsl:when>

<xsl:otherwise>

<xsl:eval>strSafeUnicodeDavHref;</xsl:eval>

</xsl:otherwise>

</xsl:choose>

</xsl:attribute>

<xsl:attribute name="id">

<xsl:value-of select="dav:propstat/dav:prop/dav:displayname"/>

</xsl:attribute>

<xsl:attribute name="target">_new</xsl:attribute>

<xsl:choose>

<xsl:when test="dav:propstat/dav:prop[dav:iscollection ='1']">

<B><xsl:value-of select="dav:propstat/dav:prop/dav:displayname"/></B>

</xsl:when>

<xsl:when test="dav:propstat/dav:prop[office:Title != '']">

<B><xsl:value-of select="dav:propstat/dav:prop/office:Title"/></B>

</xsl:when>

<xsl:otherwise>

<B><<xsl:value-of
select="/dav:multistatus/Strings/String[@_locID='L_ResultListNoTitleLabel_TE
XT']"/>></B>

</xsl:otherwise>

</xsl:choose>

</A>

I have done this change on many of the pages within my SPS install,
here's one example  (this is a copy and paste from the document I
maintain to record any changes, in case we need to reapply them when
a service pack is applied).

Change:
Edited (the new) CategoryItemsPart.xsl to make documents  load in a
new window.
Purpose:
To make documents load in a new window, we have to add a
Target=_Blank to the A links
File affected:
CategoryItemsPart.xsl
Description of changes:
At line 222 in this file, add the following code
<A><xsl:attribute name="target">_blank</xsl:attribute><xsl:attribute
name="href">
and deletethe original line, below
<A><xsl:attribute name="href">

===

This should work for you, the other ones I've changed are:

Edited SearchResultsPart.xsl to make documents load in a new window.
Purpose:
To make documents load in a new window, we have to add a
Target=_Blank to the A links
File affected:
SearchResultsPart.xsl
Description of changes:
At line 257 in this file, add the following code
<A><xsl:attribute name="target">_blank</xsl:attribute><xsl:attribute
name="href">
and deletethe original line, below
<A><xsl:attribute name="href">
The original file is called SearchResultsPart-ORIGINAL.xsl

and

Change:
Edited CategoryBestBetItemsPart.xsl to make documents load in a new
window.
Purpose:
To make documents load in a new window, we have to add a
Target=_Blank to the A links
File affected:
CategoryBestBetItemsPart.xsl
Description of changes:
At line 205 in this file, add the following code
<A><xsl:attribute name="target">_blank</xsl:attribute><xsl:attribute
name="href">
and deletethe original line, below
<A><xsl:attribute name="href">
The original file is called CategoryBestBetItemsPart-ORIGINAL.xsl

I'm not sure what I'm changing.

Do I change the:

<A><xsl:attribute name="href">

and if so, to what?:

Have you figured out how to open  the document in a new window  for the
subscription? I think this is the SubscriptionSummaryRender.xsl file. I
have not been able to do this.

I tried this but keep coming up with this error under Matching documents:

Script Execution Error: Expected token ']' found 'STRING'.
dav:propstat/dav:prop[dav:iscollection =.-->'1'<--]

Do you have anymore suggestions?

first take a backup of ur files and replace
this files with them

Ok, does anyone have the original searchresultpart.xsl file. I modified it
and undid the changes I made, but the search results still do not appear
anymore.

Thanks, I got it to work after multiple tries. Do you by any chance know how
to open  up the News, Annoucements and recently published documents  in a new
window.
Again, I thank you for all of your help.

All u need to do is to search for this tag in the xsl content which is
embedded as content property for the announcement and news  and search for
tag <A> and change it to <A target="_new">
that all

anyways i am attaching both the news and announcement webparts

If you put Announcements in a new window, what happens with the 'Go back  to the
list' link?

when u click  the go back  to the list it will go back to the dashboard page
in the same window  (i.e the opened window)

IMHO that will cause problems with visitors because now they will have two
copies of the dashboard open. Different strokes.

you can close the window  of the go back  to list page
i mean when u click  the link of go back that particular window will close
and the parent window still remains.