You see those unusual at first glance searches as a result of windows search algorythm.
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Windows Search Features (MSDN):
Start Menu Search Scope and Relevance
The Start menu searches are executed in two phases.
First, the Start menu executes a series of quick grep searches on the following set of scopes sequentially:
The Internet, if applicable
If users enter a query that begins with http:, the Start menu displays the entire query at the top of the results in the Internet group. When the user presses the Enter key, the default browser opens and handles the query.
Start menu scope
This scope includes the locations where applications install the shortcuts that users see in the Start menu when browsing All Programs:
C:\users\<username>\appdata\roaming\microsoft\windows\start menu
C:\users\all users\start menu
User-pinned scope
This scope includes the location where the list of shortcuts that the user pinned to the Taskbar is kept.
C:\users\<username>\appdata\roaming\microsoft\internet explorer\quick launch\user pinned
Libraries scope
This scope includes the location where library display names are kept.
C:\users\<username>\appdata\roaming\microsoft\windows\libraries
Known Folders scope, where known folder display names are kept.
Command line input
This scope identifies executables (*.exe) and commands for those executables. Users can execute command lines from the Start menu search box (just like they would in the Run dialog). Routines like SHEvaluateSystemCommandTemplate look for a match in the locations specified by the PATH environment variable and, if that fails, the user’s folder (c:\users\<username>). This is intended to replace the Start->Run semantics of previous Windows versions so the user can simply type cmd or regedit into the search box to run an executable.
After these results are returned and duplicates removed, the most frequently used (MFU) bias is applied and results are sorted by relevance. The topmost item is given mouse focus, so a user can quickly type a search and press the Enter key to open the top result.
Second, after all the grep searches are completed, the query is sent to the full scope of the index. Results are returned, without duplicates, and sorted by relevance.