Problem with spaces and mpx in file name

Hi,
it is no problem to upload files with spaces and a "banned" file extension (mpx) with WinSCP GUI to a remote SFTP server.
Doing this by script ends up in a message "file not found on local machine".Is there any possibility to correct this?
Excerpt from (edited) script (mpx means something other with a 3):
. 2012-01-09 15:08:52.246 Using SFTP protocol.
. 2012-01-09 15:08:52.246 Doing startup conversation with host.
> 2012-01-09 15:08:52.246 Type: SSH_FXP_INIT, Size: 5, Number: -1
< 2012-01-09 15:08:52.276 Type: SSH_FXP_VERSION, Size: 77, Number: -1
. 2012-01-09 15:08:52.276 SFTP version 5 negotiated.
. 2012-01-09 15:08:52.276 Server requests EOL sequence "\n".
. 2012-01-09 15:08:52.276 Server support information:
. 2012-01-09 15:08:52.276 Attribute mask: 8FFFFFFF, Attribute bits: 800003FF, Open flags: 7F
. 2012-01-09 15:08:52.276 Access mask: 1F8, Open block masks: 0, Block masks: 0, Max read size: 131072
. 2012-01-09 15:08:52.276 Attribute extensions (0)
. 2012-01-09 15:08:52.276 Extensions (1)
. 2012-01-09 15:08:52.276 space-available
. 2012-01-09 15:08:52.276 We will use UTF-8 strings when appropriate
. 2012-01-09 15:08:52.276 Getting current directory name.
. 2012-01-09 15:08:52.276 Getting real path for '.'
> 2012-01-09 15:08:52.276 Type: SSH_FXP_REALPATH, Size: 10, Number: 16
< 2012-01-09 15:08:52.305 Type: SSH_FXP_NAME, Size: 19, Number: 16
. 2012-01-09 15:08:52.305 Real path is '/'
. 2012-01-09 15:08:52.305 Startup conversation with host finished.
//next line edited
< 2012-01-09 15:08:52.305 Script: Active session: [1] user@host
> 2012-01-09 15:08:52.305 Script: put F:\mpx\Edith Piaf\Edith Piaf - 01 Non, je ne regrette rien.mpx /httpdocs/content/test/Edith Piaf - 01 Non, je ne regrette rien.mpx
. 2012-01-09 15:08:52.306 Copying 18 files/directories to remote directory "/"
. 2012-01-09 15:08:52.306 PrTime: Yes; PrRO: No; Rght: rw-r--r--; PrR: No (No); FnCs: N; RIC: 01; Resume: S (102400); CalcS: No; Mask: rien.mpx
. 2012-01-09 15:08:52.306 TM: M; ClAr: No; CPS: 0; ExclM(No):
. 2012-01-09 15:08:52.306 AscM: *.*html; *.htm; *.txt; *.php; *.php3; *.cgi; *.c; *.cpp; *.h; *.pas; *.bas; *.tex; *.pl; *.js; .htaccess; *.xtml; *.css; *.cfg; *.ini; *.sh; *.xml
. 2012-01-09 15:08:52.307 File: "F:\mpx\Edith"
* 2012-01-09 15:08:52.307 (EOSError) System Error. Code: 2.

* 2012-01-09 15:08:52.307 Das System kann die angegebene Datei nicht finden
. 2012-01-09 15:08:52.307 Asking user:
. 2012-01-09 15:08:52.307 File or folder 'F:\mpx\Edith' does not exist. ("System Error. Code: 2.

. 2012-01-09 15:08:52.307 Das System kann die angegebene Datei nicht finden")
* 2012-01-09 15:08:52.307 (EScpSkipFile) File or folder 'F:\mpx\Edith' does not exist.
* 2012-01-09 15:08:52.307 System Error. Code: 2.
* 2012-01-09 15:08:52.307 Das System kann die angegebene Datei nicht finden
. 2012-01-09 15:08:52.307 Script: Failed
. 2012-01-09 15:08:52.307 Closing connection.
. 2012-01-09 15:08:52.307 Sending special code: 12
. 2012-01-09 15:08:52.307 Sent EOF message

I've already tried to put the file name in quotas, but no success.

The file extension does not play a role. The same happens with other extensions and spaces in the file name, like "this is my new file.txt" - but not with "thisismynewfile.txt".

Gerhard_S wrote:

The file extension does not play a role. The same happens with other extensions and spaces in the file name, like "this is my new file.txt" - but not with "thisismynewfile.txt".

I must apologize. The logfile proves that quotas were not set. If they are set, it works fine.