Is it ok to have a dot in filename/folder name?

smalltech

Distinguished
Apr 10, 2009
537
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18,995
Hello,

Is it ok to have folder or filename that have a dot inside the name? I am just wondering if it will have any problem in future or mess up anything because of the dot. Thanks. I am using Windows 7.

Examples:

folder name: tomshardware.com
file name: tomshardware.com.txt
file name: good guide from tomshardware.com.png