I am working on migrating our current farm to SharePoint 2010. I just
ran the preupgrade check and the report came back with some interesting
findings.

I am not sure what to make of this. Can anyone help. I did a search on
this issue and found this link -
social.msdn.microsoft.com/.../
bb41d141-81c0-45d7-a570-fbc9540e8e11

Has anyone had to overcome something like this? Any assistance would be
greatly appreciated.

Issue : Missing server file or server configuration issues
Server side files are referenced in the content databases, but are not
installed on the server. Without these files, the sites may not function
completely or the content may not render correctly. Also, upgrade or
post upgrade issues may occur if these files are not available in the
new version environment. The following web part(s) are referenced by the
content, but they are not installed on the web server
Id = a21e5d41-9cab-1dd6-934f-fe972fd40238, Type = Unknown, Reference =
5, Status = Missing
Id = 2526446b-b48f-e401-0106-b98eb4df52ca, Type = Unknown, Reference =
1, Status = Missing
Id = 597af50c-a8a2-3001-353d-f1dbe7f37f95, Type = Unknown, Reference =
25, Status = Missing
Id = 8d0f5501-1608-1567-2b04-20ab4fd59e7b, Type = Unknown, Reference =
2, Status = Missing
Id = 19564d44-d42a-3c28-2e87-a3490e04a34f, Type = Unknown, Reference =
17, Status = Missing
Id = 530cf774-77de-679d-f9a3-de8e74999ba8, Type = Unknown, Reference =
6, Status = Missing
Id = eecac43f-6bd8-a40d-8841-1912ef50db63, Type = Unknown, Reference =
1, Status = Missing
Id = a7563a72-5661-4571-de0c-b2bc1de8718d, Type = Unknown, Reference =
12, Status = Missing
Id = 7c76b542-5e53-d8af-cb98-aedd154dab61, Type = Unknown, Reference =
1, Status = Missing
Id = c167c821-8b7a-598e-f56e-d94ba6459617, Type = Unknown, Reference =
1, Status = Missing
Id = 23a67bee-5a7b-ef1d-f06a-6bbe2b8e79e0, Type = Unknown, Reference =
1, Status = Missing
Id = 0a22fd3e-c3f5-d59b-dbd1-9488bf8dafa7, Type = Unknown, Reference =
1, Status = Missing
Id = fde6b95b-800a-ef92-8e70-cec9c7f4c892, Type = Unknown, Reference =
1, Status = Missing

The following setup file(s) are referenced by the content, but they are
not installed on the web server
Path = [C:\Program Files\Common Files\Microsoft Shared\Web Server
Extensions\12\Template\1033\PWA\Lists\custlist\AllItems.aspx], Reference
= [4], Status = [Missing]
Path = [C:\Program Files\Common Files\Microsoft Shared\Web Server
Extensions\12\Template\1033\PWA\Lists\custlist\DispForm.aspx], Reference
= [4], Status = [Missing]
Path = [C:\Program Files\Common Files\Microsoft Shared\Web Server
Extensions\12\Template\1033\PWA\Lists\custlist\EditForm.aspx], Reference
= [4], Status = [Missing]
Path = [C:\Program Files\Common Files\Microsoft Shared\Web Server
Extensions\12\Template\1033\PWA\Lists\custlist\NewForm.aspx], Reference
= [4], Status = [Missing]
Path = [C:\Program Files\Common Files\Microsoft Shared\Web Server
Extensions\12\Template\1033\SPS\DMFramesetTopFrame.aspx], Reference =
[1], Status = [Missing]
Path = [C:\Program Files\Common Files\Microsoft Shared\Web Server
Extensions\12\Template\1033\SPS\moreinfo.aspx], Reference = [1], Status
= [Missing]
Path = [C:\Program Files\Common Files\Microsoft Shared\Web Server
Extensions\12\Template\1033\SPS\search.aspx], Reference = [1], Status =
[Missing]
Path = [C:\Program Files\Common Files\Microsoft Shared\Web Server
Extensions\12\Template\1033\SPSSITES\Lists\siteslst\Summary.aspx],
Reference = [1], Status = [Missing]