PS> touch ab.txt 'a b.txt'

# Question mark character works

PS> find -name 'a?.txt'
ab.txt

PS> find -name 'a??.txt'
a b.txt

# Asterisk appears to be being expanded into file names

PS> find -name 'a*b.txt'
/usr/bin/find: paths must precede expression: ab.txt
Usage: /usr/bin/find [-H] [-L] [-P] [-Olevel] [-D help|tree|search|stat|rates|opt|exec|time] [path...] [expression]

# Escaping asterisk doesn't work

PS> find -name 'a`*b.txt'
# No output, which indicates the parameters were accepted, but the search produced no results.

PS> find -name 'a*b.txt'
./ab.txt
./a b.txt

PS> find -name 'a*b.txt'
/usr/bin/find: paths must precede expression: ab.txt
Usage: /usr/bin/find [-H] [-L] [-P] [-Olevel] [-D help|tree|search|stat|rates|opt|exec|time] [path...] [expression]

> $PSVersionTable
Name                           Value                                           
----                           -----                                           
PSVersion                      6.0.0-beta                                      
PSEdition                      Core                                            
GitCommitId                    v6.0.0-beta.6                                   
OS                             Linux 4.4.0-92-generic #115-Ubuntu SMP Thu Au...
Platform                       Unix                                            
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                         
PSRemotingProtocolVersion      2.3                                             
SerializationVersion           1.1.0.1                                         
WSManStackVersion              3.0