Oeps, I have now entered my new question in a new post:

Hi Jonah,

Your aswer helped a lot. However, new problems arise.

After I converted my image file from MRIcron (with extension *.nii.gz (why don't they tell that one needs this extension?) and select it, the SDM program keeps on asking whether this is a t-map (it is), MNI (it is) and degree of freedom (I entered 48.00), and never stops asking this time after time... Below is my log file:

All help appreciated!

Best, Frank

Launching Image conversion...

Error on launching Mean (trying C:/Program Files/SdmPsiGui-win64-v6.21/bin/windows64\/imgcalc.exe "C:/Users/fjvoverw/OneDrive/My Experiments/MultiStudies/BasalGanglia/Tmaps_SoSqNsSq/spmT_0004 Pict TrueB Control.nii.gz" -set_t 48 SDM)

Error on launching Mean (trying C:/Program Files/SdmPsiGui-win64-v6.21/bin/windows64\/imgcalc.exe "C:/Users/fjvoverw/OneDrive/My Experiments/MultiStudies/BasalGanglia/Tmaps_SoSqNsSq/spmT_0004 Pict TrueB Control.nii.gz" -set_mni SDM)

Error on launching Mean (trying C:/Program Files/SdmPsiGui-win64-v6.21/bin/windows64\/imgcalc.exe "C:/Users/fjvoverw/OneDrive/My Experiments/MultiStudies/BasalGanglia/Tmaps_SoSqNsSq/spmT_0004 Pict TrueB Control.nii.gz" -set_t 48 SDM)

Error on launching Mean (trying C:/Program Files/SdmPsiGui-win64-v6.21/bin/windows64\/imgcalc.exe "C:/Users/fjvoverw/OneDrive/My Experiments/MultiStudies/BasalGanglia/Tmaps_SoSqNsSq/spmT_0004 Pict TrueB Control.nii.gz" -set_mni SDM)

Error on launching Mean (trying C:/Program Files/SdmPsiGui-win64-v6.21/bin/windows64\/imgcalc.exe "C:/Users/fjvoverw/OneDrive/My Experiments/MultiStudies/BasalGanglia/Tmaps_SoSqNsSq/spmT_0004 Pict TrueB Control.nii.gz" -set_t 48 SDM)

Error on launching Mean (trying C:/Program Files/SdmPsiGui-win64-v6.21/bin/windows64\/imgcalc.exe "C:/Users/fjvoverw/OneDrive/My Experiments/MultiStudies/BasalGanglia/Tmaps_SoSqNsSq/spmT_0004 Pict TrueB Control.nii.gz" -set_mni SDM)

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Launching Image conversion...

Error on launching Mean (trying C:/Program Files/SdmPsiGui-win64-v6.21/bin/windows64\/imgcalc.exe "C:/Users/fjvoverw/OneDrive/My Experiments/MultiStudies/BasalGanglia/Tmaps_SoSqNsSq/spmT_0004 Pict TrueB Control.nii.gz" -set_t 48 SDM)

Error on launching Mean (trying C:/Program Files/SdmPsiGui-win64-v6.21/bin/windows64\/imgcalc.exe "C:/Users/fjvoverw/OneDrive/My Experiments/MultiStudies/BasalGanglia/Tmaps_SoSqNsSq/spmT_0004 Pict TrueB Control.nii.gz" -set_mni SDM)

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Dear Jonah, 

Sorry for the delay. Could you try to remove all spaces from your path: using eg.  spmT_0004_Pict_TrueB_Control.nii.gz

Best, 

Lydia