Hi,
The SharePoint crawl component can only crawl a file if the list on the Manage File Types page includes the file name extension. The following table shows all the file formats that SharePoint 2013 has built-in format handlers for. The table shows one
or several format ID and file name extensions for each file format. By default SharePoint 2013 is enabled to parse files that have these file formats and file name extensions. For each file name extension the table also indicates whether the Manage File Types
page by default includes the file name extension.
File format
|
Format ID
|
File name extension
|
File name extension listed on the Manage File Types page by default
|
Email message
|
eml
|
.eml
|
Yes
|
Email message
|
nws
|
.nws
|
Yes
|
HTML
|
html
|
.ascx
|
Yes
|
HTML
|
html
|
.asp
|
Yes
|
HTML
|
html
|
.aspx
|
Yes
|
HTML
|
html
|
.css
|
No
|
HTML
|
html
|
.hta
|
No
|
HTML
|
html
|
.htm
|
Yes
|
HTML
|
html
|
.html
|
Yes
|
HTML
|
html
|
.htw
|
No
|
HTML
|
html
|
.htx
|
No
|
HTML
|
html
|
.jhtml
|
No
|
HTML
|
html
|
.stm
|
No
|
MHTML document
|
mhtml
|
.mht
|
Yes
|
MHTML document
|
mhtml
|
.mhtml
|
Yes
|
Microsoft Excel
|
xlb
|
.xlb
|
No
|
Microsoft Excel
|
xlc
|
.xlc
|
No
|
Microsoft Excel
|
xls
|
.xls
|
Yes
|
Microsoft Excel
|
xlsb
|
.xlsb
|
Yes
|
Microsoft Excel
|
xlsm
|
.xlsm
|
Yes
|
Microsoft Excel
|
xlsx
|
.xlsx
|
Yes
|
Microsoft Excel
|
xlt
|
.xlt
|
No
|
Microsoft OneNote
|
one
|
.one
|
No
|
Microsoft PowerPoint
|
pot
|
.pot
|
No
|
Microsoft PowerPoint
|
ppa
|
.ppa
|
No
|
Microsoft PowerPoint
|
pps
|
.pps
|
No
|
Microsoft PowerPoint
|
ppt
|
.ppt
|
Yes
|
Microsoft PowerPoint
|
pptm
|
.pptm
|
Yes
|
Microsoft PowerPoint
|
pptx
|
.pptx
|
Yes
|
Microsoft Publisher
|
pub
|
.pub
|
Yes
|
Microsoft Word
|
doc
|
.doc
|
Yes
|
Microsoft Word
|
docm
|
.docm
|
Yes
|
Microsoft Word
|
docx
|
.docx
|
Yes
|
Microsoft Word
|
dot
|
.dot
|
Yes
|
Microsoft Word
|
dotx
|
.dotx
|
Yes
|
Microsoft XPS
|
xps
|
.xps
|
No
|
Open Document Chart
|
odc
|
.odc
|
Yes
|
Open Document Presentation
|
odp
|
.odp
|
Yes
|
Open Document Spreadsheet
|
ods
|
.ods
|
Yes
|
Open Document Text
|
odt
|
.odt
|
Yes
|
Outlook item
|
msg
|
.msg
|
Yes
|
Portable Document Format
|
pdf
|
.pdf
|
Yes
|
Rich Text Format
|
rtf
|
.rtf
|
No
|
Text
|
txt
|
.asm
|
Yes
|
Text
|
txt
|
.bat
|
No
|
Text
|
txt
|
.c
|
No
|
Text
|
txt
|
.cmd
|
No
|
Text
|
txt
|
.cpp
|
No
|
Text
|
txt
|
.csv
|
Yes
|
Text
|
txt
|
.cxx
|
Yes
|
Text
|
txt
|
.def
|
Yes
|
Text
|
txt
|
.h
|
No
|
Text
|
txt
|
.hpp
|
No
|
Text
|
txt
|
.lnk
|
No
|
Text
|
txt
|
.mpx
|
No
|
Text
|
txt
|
.php
|
No
|
Text
|
txt
|
.trf
|
No
|
Text
|
txt
|
.txt
|
Yes
|
Text
|
txt
|
.url
|
No
|
TIFF
|
tiff
|
.tif
|
No
|
TIFF
|
tiff
|
.tiff
|
No
|
Visio
|
vdw
|
.vdw
|
Yes
|
Visio
|
vdx
|
.vdx
|
Yes
|
Visio
|
vsd
|
.vsd
|
Yes
|
Visio
|
vsdm
|
.vsdm
|
Yes
|
Visio
|
vsdx
|
.vsdx
|
Yes
|
Visio
|
vss
|
.vss
|
Yes
|
Visio
|
vssm
|
.vssm
|
Yes
|
Visio
|
vssx
|
.vssx
|
Yes
|
Visio
|
vst
|
.vst
|
Yes
|
Visio
|
vstm
|
.vstm
|
Yes
|
Visio
|
vstx
|
.vstx
|
Yes
|
Visio
|
vsx
|
.vsx
|
Yes
|
Visio
|
vtx
|
.vtx
|
Yes
|
XML
|
xml
|
.jsp
|
Yes
|
XML
|
xml
|
.mspx
|
No
|
XML
|
xml
|
.rss
|
No
|
XML
|
xml
|
.xml
|
Yes
|
ZIP
|
zip
|
.zip
|
Yes
|
Reference:
https://technet.microsoft.com/en-in/library/jj219530.aspx
So for .xlt file, SharePoint 2013 can crawl it if you add it on the Manage File Types page as SharePoint 2013 has built-in format handlers for. But for .mpp file, SharePoint cannot crawl it even if you add it on the Manage File Types page. You
need to install the appropriate IFilter to make it crawlable.
Reference:
https://social.technet.microsoft.com/Forums/sharepoint/en-US/bd6cb4cf-a95e-4d27-ba7a-375e85061bcf/mpp-and-mpt-extention-files-are-not-retrieving-in-advanced-search-results?forum=sharepointsearchprevious
https://social.technet.microsoft.com/Forums/office/en-US/88e1fd10-add0-420d-98ed-17c76fa89e59/ifilter-for-microsoft-project-mpp?forum=sharepointsearchlegacy
Best Regards,
Eric