Strange character appear when writing to text file.

Hello, I am facing some problem when I read some data from and binary file (.dat) and then saving them into text file.
When I convert those data into string and then write to a text file. Some strange characters were found in the file when I opened it with excel. Could anybody tell me how these strange characters( ) are generated and how to eliminate them?
The VI , .dat file and the text file are attached as below.(use the "open file" in the menu to open .dat file and then use the "export file" in menu to export to text file)
Thank you very much......
The .dat and text file are attached in the next post.
Attachments:
test2.xls ‏1 KB
VPSDataViewer_vac_temp2.vi ‏111 KB
Sel_File.vi ‏20 KB

raw data file.
Thank you very much.
the vpsxxxx.ini is the raw data(file with .dat extension cannot be attached).
viewer.vi is the menu file. (please change the file name to viewer.rtm, also for attaching file purpose. ^_^)
Attachments:
VPS20070107_152605.ini ‏2 KB
Viewer.vi ‏1 KB

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Strange character appear when writing to text file.

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