diff --git a/src/modules/punk-0.1.tm b/src/modules/punk-0.1.tm
index f9d51b1..0123e23 100644
--- a/src/modules/punk-0.1.tm
+++ b/src/modules/punk-0.1.tm
@@ -3534,6 +3534,9 @@ namespace eval punk {
             error "usage: punk::xmore args where args are run as {*}\$args | more"
         }
     }
+
+    #review - is this intended to be useful/callable on non-windows platforms?
+    #it should in theory be useable from another platform that wants to create a path for use on windows.
     proc winpath {path} {
         #NOTE: tcl file exists gives different answers on windows for paths like  /c depending on cwd (presumably based on file pathtype of volumerelative)
         #This is add odds with attempting to navigate on a windows system which has cygwin, wsl etc... It also makes it difficult for functions intended to operate independent of CWD.
@@ -3591,6 +3594,12 @@ namespace eval punk {
             set path [file normalize $path]
             #may still not exist.. that's ok.
         }
+        #file normalize may change backslashes to forward slashes.. including things like the special \\?\ prefix which is intended to stop windows api from parsing a name
+        #2023 - this is ok as //?/ also seems to work.. but it is unclear if that is because Tcl is re-converting to backslashes 
+        if {[punk::winpath_illegalname_test] $path} {
+            set path [punk::winpath_illegalname_fix $path]
+        }
+
         return $path
     }
     proc windir {path} {
@@ -3666,10 +3675,22 @@ namespace eval punk {
         set a1 [lindex $args 0]
         set a2 [lindex $args 1]
         set a3 [lindex $args 2]
+        set fileops [list -b -c -d -e -f -h -L -s -S -x -w]
         if {[llength $args] == 1} {
             #equivalent of -n STRING
             set boolresult [expr {[string length $a1] != 0}]
         } elseif {[llength $args] == 2} {
+            if {$a1 in $fileops} {
+                if {$::tcl_platform(platform) eq "windows"} {
+                    #e.g trailing dot or trailing space
+                    if {[punk::winpath_illegalname_test $a2]} {
+                        #protect with \\?\ to stop windows api from parsing 
+                        #will do nothing if already prefixed with \\?\
+
+                        set a2 [punk::winpath_illegalname_fix $a2]
+                    }
+                }
+            }
             switch  -- $a1 {
                 -b {
                     #dubious utility on FreeBSD, windows?
@@ -4765,7 +4786,92 @@ namespace eval punk {
     interp alias {} aliases {} punk aliases
     interp alias {} alias {} punk alias
     interp alias {} treemore {} punk::xmore tree
-    interp alias {} fcat     {} fileutil::cat
+
+    #we don't validate that path is actually illegal because we don't know the full range of such names.
+    #The caller can apply this to any path.
+    #don't test for platform here - needs to be callable from any platform for potential passing to windows
+    proc winpath_illegalname_fix {path} {
+        if {[file pathtype $path] eq "absolute"} {
+            set fullpath $path
+        } else {
+            set fullpath [pwd]/$path
+        }
+        #For file I/O, the "\\?\" prefix to a path string tells the Windows APIs to disable all string parsing
+        # and to send the string that follows it straight to the file system.
+        set protect {\\?}
+        append protect "\\"
+        set protect2 "//?/" ;#file normalize may do this - it still works 
+        #don't add extra protect-prefix if already done
+        if {[string range $path 0 3] in [list $protect $protect2]} {
+            return $path
+        }
+        return ${protect}$fullpath
+    }
+
+    #don't test for platform here - needs to be callable from any platform for potential passing to windows
+    proc winpath_illegalname_test {path} {
+        set protect "\\\\?\\"  ;# value is: \\?\
+        #todo - test folder segments within path?
+        #first test if already protected - we return false even if the file would be illegal without the protection!
+        if {[string range $path 0 3] eq $protect} {
+            return 0
+        }
+        if {[string index $path end] in [list " " "."]} {
+            #windows API doesn't handle trailing dots or spaces (silently strips?) - even though such files can be created on NTFS systems (or seen via samba etc)
+            return 1
+        }
+        #glob chars '* ?' are probably illegal.. but although x*y.txt and x?y.txt don't display properly (* ? replaced with some other glyph)
+        #- they seem to be readable from cmd and tclsh as is.
+        # pipe symbol also has glyph substitution and behaves the same  e.g a|b.txt
+        #(at least with encoding system utf-8)
+
+        #todo - determine what else constitutes an illegal name according to windows APIs and requires protection
+        return 0
+    }
+
+    proc fcat {args} {
+        if {$::tcl_platform(platform) ne "windows"} {
+            return [fileutil::cat {*}$args]
+        }
+
+        set knownopts [list -eofchar -translation -encoding]
+        set last_opt 0
+        for {set i 0} {$i < [llength $args]} {incr i} {
+            puts stdout "i:$i a: [lindex $args $i] known: [expr {[lindex $args $i] in $knownopts}]"
+            if {[lindex $args $i] in $knownopts} {
+                puts ">known at $i : [lindex $args $i]"
+                if {($i % 2) != 0} {
+                    error "unexpected option at index $i. known options: $knownopts must come in -opt val pairs."
+                }
+                incr i
+                set last_opt $i
+            } else {
+               set last_opt [expr {$i - 1}] 
+               break
+            }
+        }
+        set first_non_opt [expr {$last_opt + 1}]
+
+        puts stderr "first_non_opt: $first_non_opt"
+        set opts [lrange $args -1 $first_non_opt-1]
+        set paths [lrange $args $first_non_opt end]
+        if {![llength $paths]} {
+            error "Unable to find file in the supplied arguments: $args. Ensure options are all -opt val pairs and that file name(s) follow"
+        }
+        puts stderr "opts: $opts  paths: $paths"
+        set finalpaths [list]
+        foreach p $paths {
+            if {[punk::winpath_illegalname_test $p]} {
+                lappend finalpaths [punk::winpath_illegalname_fix $p]
+            } else {
+                lappend finalpaths $p
+            }
+        }
+        fileutil::cat {*}$opts {*}$finalpaths
+    }
+
+    #fileutil::cat except with checking for windows illegal path names (when on windows platform)
+    interp alias {} fcat     {} punk::fcat
 
     #----------------------------------------------
     interp alias {} linelistraw {} punk::linelistraw